Pub Date : 2025-02-03DOI: 10.1103/physrevb.111.075105
Shunsuke Yamada, Tomohito Otobe
Nonlinear electronic excitation in laser-irradiated silicon at finite electron temperatures is numerically investigated by first-principles calculations based on the time-dependent density functional theory. In bulk silicon at finite temperatures under near-infrared laser irradiation, we found that the absorbed energy is saturated when using a certain laser intensity even with a few-cycle pulse. Although one-photon processes of conduction-to-conduction and valence-to-valence transitions are dominant at such a laser intensity, the Pauli blocking inhibits further one-photon transition. With higher intensities, multiphoton excitation across the bandgap overwhelms the one-photon excitation and the saturable absorption disappears. At the surface of finite-temperature silicon, the Pauli blocking is suppressed by the symmetry breaking and the absorbed energy is relatively enhanced from the energy of the saturable absorption in the bulk region. Published by the American Physical Society2025
{"title":"Saturable absorption in highly excited laser-irradiated silicon and its suppression at the surface","authors":"Shunsuke Yamada, Tomohito Otobe","doi":"10.1103/physrevb.111.075105","DOIUrl":"https://doi.org/10.1103/physrevb.111.075105","url":null,"abstract":"Nonlinear electronic excitation in laser-irradiated silicon at finite electron temperatures is numerically investigated by first-principles calculations based on the time-dependent density functional theory. In bulk silicon at finite temperatures under near-infrared laser irradiation, we found that the absorbed energy is saturated when using a certain laser intensity even with a few-cycle pulse. Although one-photon processes of conduction-to-conduction and valence-to-valence transitions are dominant at such a laser intensity, the Pauli blocking inhibits further one-photon transition. With higher intensities, multiphoton excitation across the bandgap overwhelms the one-photon excitation and the saturable absorption disappears. At the surface of finite-temperature silicon, the Pauli blocking is suppressed by the symmetry breaking and the absorbed energy is relatively enhanced from the energy of the saturable absorption in the bulk region. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"14 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-03DOI: 10.1103/physrevb.111.054101
Jialun Liu, David Yang, Ana F. Suzana, Steven J. Leake, Ian K. Robinson
We report a detailed investigation into the response of single BaTiO3 (BTO) nanocrystals under applied electric fields (E-field) using Bragg coherent diffraction imaging. Our study reveals pronounced domain wall migration and expansion of a sample measure under applied electric field. The changes are most prominent at the surface of the nanocrystal, where the lack of external strain allows greater domain wall mobility. The observed domain shifts are correlated to the strength and orientation of the applied E-field, following a side-by-side domain model from Suzana []. Notably, we identified a critical electric field strength of 3 MV/m, which leads to irreversible structural changes, suggesting plastic deformation. The findings highlight how surface effects and intrinsic defects contribute to the enhanced dielectric properties of BTO at the nanoscale, in contrast to bulk materials, where strain limits domain mobility. These findings deepen our understanding of nanoscale dielectric behavior and inform the design of advanced nanoelectronic devices. Published by the American Physical Society2025
{"title":"Electric field driven domain wall dynamics in BaTiO3 nanoparticles","authors":"Jialun Liu, David Yang, Ana F. Suzana, Steven J. Leake, Ian K. Robinson","doi":"10.1103/physrevb.111.054101","DOIUrl":"https://doi.org/10.1103/physrevb.111.054101","url":null,"abstract":"We report a detailed investigation into the response of single BaTiO</a:mi>3</a:mn></a:msub></a:math> (BTO) nanocrystals under applied electric fields (E-field) using Bragg coherent diffraction imaging. Our study reveals pronounced domain wall migration and expansion of a sample measure under applied electric field. The changes are most prominent at the surface of the nanocrystal, where the lack of external strain allows greater domain wall mobility. The observed domain shifts are correlated to the strength and orientation of the applied E-field, following a side-by-side domain model from Suzana []. Notably, we identified a critical electric field strength of 3 MV/m, which leads to irreversible structural changes, suggesting plastic deformation. The findings highlight how surface effects and intrinsic defects contribute to the enhanced dielectric properties of BTO at the nanoscale, in contrast to bulk materials, where strain limits domain mobility. These findings deepen our understanding of nanoscale dielectric behavior and inform the design of advanced nanoelectronic devices. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"10 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-03DOI: 10.1103/physrevb.111.085103
Lukas Litzba, Eric Kleinherbers, Jürgen König, Ralf Schützhold, Nikodem Szpak
We consider a fermionic quantum system exchanging particles with an environment at a fixed temperature and study its reduced evolution by means of a Redfield-I equation with time-dependent (non-Markovian) coefficients. We find that the description can be efficiently reduced to a standard-form Redfield-II equation, however, with a obeying a universal law. At early times, after the system and environment start in a product state, the appears to be very high, yet eventually it settles down towards the true environment value. In this way, we obtain a time-local master equation, offering high accuracy at all times and preserving the crucial properties of the density matrix. It includes non-Markovian relaxation processes beyond the secular approximation and time-averaging methods and can be further applied to various types of Gorini-Kossakowski-Sudarshan-Lindblad equations. We derive the theory from first principles and discuss its application using a simple example of a single quantum dot. Published by the American Physical Society2025
{"title":"Effective time-dependent temperature for fermionic master equations beyond the Markov and the secular approximations","authors":"Lukas Litzba, Eric Kleinherbers, Jürgen König, Ralf Schützhold, Nikodem Szpak","doi":"10.1103/physrevb.111.085103","DOIUrl":"https://doi.org/10.1103/physrevb.111.085103","url":null,"abstract":"We consider a fermionic quantum system exchanging particles with an environment at a fixed temperature and study its reduced evolution by means of a Redfield-I equation with time-dependent (non-Markovian) coefficients. We find that the description can be efficiently reduced to a standard-form Redfield-II equation, however, with a obeying a universal law. At early times, after the system and environment start in a product state, the appears to be very high, yet eventually it settles down towards the true environment value. In this way, we obtain a time-local master equation, offering high accuracy at all times and preserving the crucial properties of the density matrix. It includes non-Markovian relaxation processes beyond the secular approximation and time-averaging methods and can be further applied to various types of Gorini-Kossakowski-Sudarshan-Lindblad equations. We derive the theory from first principles and discuss its application using a simple example of a single quantum dot. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"16 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-03DOI: 10.1103/physrevb.111.064406
Andriy Smolyanyuk, Libor Šmejkal, Igor I. Mazin
RuO2 is one of the most highlighted candidates for altermagnetism. However, the most recent muon spin spectroscopy and neutron studies demonstrated the absence of magnetic order in this system. The electronic structure of RuO2 hints at a possibility of realizing a magnetically ordered state upon hole doping, and such a possibility was explored experimentally in Cr-doped RuO2, where it was suggested that this system exhibits the anomalous Hall effect (AHE) due to altermagnetism. In this paper, based on our density functional calculations, we revise the results obtained for this system and propose a different interpretation of experimental results. Our calculations suggest that extra holes are bound to Cr impurity and do not dope Ru bands, which remain nonmagnetic. Thus, the observed AHE is not due to the altermagnetism but stems entirely from magnetic Cr ions. Published by the American Physical Society2025
{"title":"Origin of the anomalous Hall effect in Cr-doped RuO2","authors":"Andriy Smolyanyuk, Libor Šmejkal, Igor I. Mazin","doi":"10.1103/physrevb.111.064406","DOIUrl":"https://doi.org/10.1103/physrevb.111.064406","url":null,"abstract":"RuO</a:mi>2</a:mn></a:msub></a:math> is one of the most highlighted candidates for altermagnetism. However, the most recent muon spin spectroscopy and neutron studies demonstrated the absence of magnetic order in this system. The electronic structure of <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:msub><b:mi>RuO</b:mi><b:mn>2</b:mn></b:msub></b:math> hints at a possibility of realizing a magnetically ordered state upon hole doping, and such a possibility was explored experimentally in Cr-doped <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:msub><c:mi>RuO</c:mi><c:mn>2</c:mn></c:msub></c:math>, where it was suggested that this system exhibits the anomalous Hall effect (AHE) due to altermagnetism. In this paper, based on our density functional calculations, we revise the results obtained for this system and propose a different interpretation of experimental results. Our calculations suggest that extra holes are bound to Cr impurity and do not dope Ru bands, which remain nonmagnetic. Thus, the observed AHE is not due to the altermagnetism but stems entirely from magnetic Cr ions. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"51 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-03DOI: 10.1103/physrevb.111.075102
Sirui Lu, Giacomo Giudice, J. Ignacio Cirac
We introduce a variational Monte Carlo algorithm for approximating finite-temperature quantum many-body systems, based on the minimization of a modified free energy. This approach directly approximates the state at a fixed temperature, allowing for systematic improvement of the expressiveness without accumulating errors from iterative imaginary-time evolution. We employ a variety of trial states—both tensor networks as well as neural networks—as variational for our numerical optimization. We benchmark and compare different constructions in the above classes, both for one- and two-dimensional problems, with systems made of up to N=100 spins. Our results demonstrate that while restricted Boltzmann machines show limitations, string bond tensor network states exhibit systematic improvements with increasing bond dimensions and the number of strings. Published by the American Physical Society2025
{"title":"Variational neural and tensor network approximations of thermal states","authors":"Sirui Lu, Giacomo Giudice, J. Ignacio Cirac","doi":"10.1103/physrevb.111.075102","DOIUrl":"https://doi.org/10.1103/physrevb.111.075102","url":null,"abstract":"We introduce a variational Monte Carlo algorithm for approximating finite-temperature quantum many-body systems, based on the minimization of a modified free energy. This approach directly approximates the state at a fixed temperature, allowing for systematic improvement of the expressiveness without accumulating errors from iterative imaginary-time evolution. We employ a variety of trial states—both tensor networks as well as neural networks—as variational for our numerical optimization. We benchmark and compare different constructions in the above classes, both for one- and two-dimensional problems, with systems made of up to N</a:mi>=</a:mo>100</a:mn></a:mrow></a:math> spins. Our results demonstrate that while restricted Boltzmann machines show limitations, string bond tensor network states exhibit systematic improvements with increasing bond dimensions and the number of strings. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"3 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-03DOI: 10.1103/physrevb.111.054103
Heikki Muhli, Tapio Ala-Nissila, Miguel A. Caro
A common approach to modeling dispersion interactions and overcoming the inaccurate description of long-range correlation effects in electronic structure calculations is the use of pairwise-additive potentials, as in the Tkatchenko-Scheffler [] method. In previous work [H. Muhli , ], we have shown how these are amenable to highly efficient atomistic simulation by machine learning their local parametrization. However, the atomic polarizability and the electron correlation energy have a complex and nonlocal many-body character and some of the dispersion effects in complex systems are not sufficiently described by these types of pairwise-additive potentials. Currently, one of the most widely used rigorous descriptions of the many-body effects is based on the many-body dispersion (MBD) model [A. Tkatchenko , ]. In this work, we show that the MBD model can also be locally parametrized to derive a local approximation for the highly nonlocal many-body effects. With this local parametrization, we develop an atomwise formulation of MBD that we refer to as linear MBD (lMBD), as this decomposition enables linear scaling with system size. This model provides a transparent and controllable approximation to the full MBD model with tunable convergence parameters for a fraction of the computational cost observed in electronic structure calculations with popular density-functional theory codes. We show that our model scales linearly with the number of atoms in the system and is easily parallelizable. Furthermore, we show how using the same machinery already established in previous work for predicting Hirshfeld volumes with machine learning enables access to large-scale simulations with MBD-level corrections. Published by the American Physical Society2025
{"title":"Atom-wise formulation of the many-body dispersion problem for linear-scaling van der Waals corrections","authors":"Heikki Muhli, Tapio Ala-Nissila, Miguel A. Caro","doi":"10.1103/physrevb.111.054103","DOIUrl":"https://doi.org/10.1103/physrevb.111.054103","url":null,"abstract":"A common approach to modeling dispersion interactions and overcoming the inaccurate description of long-range correlation effects in electronic structure calculations is the use of pairwise-additive potentials, as in the Tkatchenko-Scheffler [] method. In previous work [H. Muhli , ], we have shown how these are amenable to highly efficient atomistic simulation by machine learning their local parametrization. However, the atomic polarizability and the electron correlation energy have a complex and nonlocal many-body character and some of the dispersion effects in complex systems are not sufficiently described by these types of pairwise-additive potentials. Currently, one of the most widely used rigorous descriptions of the many-body effects is based on the many-body dispersion (MBD) model [A. Tkatchenko , ]. In this work, we show that the MBD model can also be locally parametrized to derive a local approximation for the highly nonlocal many-body effects. With this local parametrization, we develop an atomwise formulation of MBD that we refer to as linear MBD (lMBD), as this decomposition enables linear scaling with system size. This model provides a transparent and controllable approximation to the full MBD model with tunable convergence parameters for a fraction of the computational cost observed in electronic structure calculations with popular density-functional theory codes. We show that our model scales linearly with the number of atoms in the system and is easily parallelizable. Furthermore, we show how using the same machinery already established in previous work for predicting Hirshfeld volumes with machine learning enables access to large-scale simulations with MBD-level corrections. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"15 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-31DOI: 10.1103/physrevb.111.035157
Antonio M. García-García, Lucas Sá, Jacobus J. M. Verbaarschot, Can Yin
The identification, description, and classification of topological features is an engine of discovery and innovation in several fields of physics. This research encompasses a broad variety of systems, from the integer and fractional Chern insulators in condensed matter, to protected states in complex photonic lattices in optics, and the structure of the QCD vacuum. Here, we introduce another playground for topology: the dissipative dynamics of pseudo-Hermitian many-body quantum systems. For that purpose, we study two different systems, the dissipative Sachdev-Ye-Kitaev (SYK) model, and a quantum chaotic dephasing spin chain. For the two different many-body models, we find the same topological features for a wide range of parameters suggesting that they are universal. In the SYK model, we identify four universality classes, related to pseudo-Hermiticity, characterized by a rectangular block representation of the vectorized Liouvillian that is directly related to the existence of an anomalous trace of the unitary operator implementing fermionic exchange. As a consequence of this rectangularization, we identify a topological index ν that only depends on symmetry. Another distinct consequence of the rectangularization is the observation, for any coupling to the bath, of purely real topological modes in the Liouvillian. The level statistics of these real modes agree with that of the corresponding random matrix ensemble and therefore can be employed to characterize the four topological symmetry classes. In the limit of weak coupling to the bath, topological modes govern the approach to equilibrium, which may enable a direct path for experimental confirmation of topology in dissipative many-body quantum chaotic systems. Published by the American Physical Society2025
{"title":"Emergent topology in many-body dissipative quantum matter","authors":"Antonio M. García-García, Lucas Sá, Jacobus J. M. Verbaarschot, Can Yin","doi":"10.1103/physrevb.111.035157","DOIUrl":"https://doi.org/10.1103/physrevb.111.035157","url":null,"abstract":"The identification, description, and classification of topological features is an engine of discovery and innovation in several fields of physics. This research encompasses a broad variety of systems, from the integer and fractional Chern insulators in condensed matter, to protected states in complex photonic lattices in optics, and the structure of the QCD vacuum. Here, we introduce another playground for topology: the dissipative dynamics of pseudo-Hermitian many-body quantum systems. For that purpose, we study two different systems, the dissipative Sachdev-Ye-Kitaev (SYK) model, and a quantum chaotic dephasing spin chain. For the two different many-body models, we find the same topological features for a wide range of parameters suggesting that they are universal. In the SYK model, we identify four universality classes, related to pseudo-Hermiticity, characterized by a rectangular block representation of the vectorized Liouvillian that is directly related to the existence of an anomalous trace of the unitary operator implementing fermionic exchange. As a consequence of this rectangularization, we identify a topological index ν</a:mi></a:math> that only depends on symmetry. Another distinct consequence of the rectangularization is the observation, for any coupling to the bath, of purely real topological modes in the Liouvillian. The level statistics of these real modes agree with that of the corresponding random matrix ensemble and therefore can be employed to characterize the four topological symmetry classes. In the limit of weak coupling to the bath, topological modes govern the approach to equilibrium, which may enable a direct path for experimental confirmation of topology in dissipative many-body quantum chaotic systems. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"39 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-31DOI: 10.1103/physrevb.111.024514
G. P. Mikitik
Using a distribution of the Meissner currents over the surface of an infinitely long superconducting slab with a rectangular cross section, the magnetic moment of the slab is calculated, taking into account corrections associated with a small but finite value of the London penetration depth λ. Since these corrections determine the shift of the resonant frequency in the tunnel-diode oscillator technique, formulas for determining λ within this technique are derived for the slab. These formulas are valid for any aspect ratio of its cross section, and they differ from those that are often used in analyzing experimental data. Specifically, it is shown that the sharp edges of the slab can cause a large frequency shift proportional to the change in the value of λ2/3. Although this result complicates the extraction of a temperature dependence of λ from the frequency shift, it also opens up additional possibilities for determining the London penetration depth. In particular, under certain conditions, it is possible not only to measure the changes in λ with temperature, but also to estimate its absolute value. Published by the American Physical Society2025
{"title":"Determination of the London penetration depth with the tunnel diode oscillator technique","authors":"G. P. Mikitik","doi":"10.1103/physrevb.111.024514","DOIUrl":"https://doi.org/10.1103/physrevb.111.024514","url":null,"abstract":"Using a distribution of the Meissner currents over the surface of an infinitely long superconducting slab with a rectangular cross section, the magnetic moment of the slab is calculated, taking into account corrections associated with a small but finite value of the London penetration depth λ</a:mi></a:math>. Since these corrections determine the shift of the resonant frequency in the tunnel-diode oscillator technique, formulas for determining <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mi>λ</b:mi></b:math> within this technique are derived for the slab. These formulas are valid for any aspect ratio of its cross section, and they differ from those that are often used in analyzing experimental data. Specifically, it is shown that the sharp edges of the slab can cause a large frequency shift proportional to the change in the value of <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:msup><c:mi>λ</c:mi><c:mrow><c:mn>2</c:mn><c:mo>/</c:mo><c:mn>3</c:mn></c:mrow></c:msup></c:math>. Although this result complicates the extraction of a temperature dependence of <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\"><d:mi>λ</d:mi></d:math> from the frequency shift, it also opens up additional possibilities for determining the London penetration depth. In particular, under certain conditions, it is possible not only to measure the changes in <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mi>λ</e:mi></e:math> with temperature, but also to estimate its absolute value. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"53 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-29DOI: 10.1103/physrevb.111.024209
Céline Crépisson, Alexis Amouretti, Marion Harmand, Chrystèle Sanloup, Patrick Heighway, Sam Azadi, David McGonegle, Thomas Campbell, Juan Pintor, David Alexander Chin, Ethan Smith, Linda Hansen, Alessandro Forte, Thomas Gawne, Hae Ja Lee, Bob Nagler, YuanFeng Shi, Guillaume Fiquet, François Guyot, Mikako Makita, Alessandra Benuzzi-Mounaix, Tommaso Vinci, Kohei Miyanishi, Norimasa Ozaki, Tatiana Pikuz, Hirotaka Nakamura, Keiichi Sueda, Toshinori Yabuuchi, Makina Yabashi, Justin S. Wark, Danae N. Polsin, Sam M. Vinko
We present measurements on Fe2O3 amorphization and melt under laser-driven shock compression up to 209(10) GPa via time-resolved x-ray diffraction. At 122(3) GPa, a diffuse signal is observed indicating the presence of a noncrystalline phase. Structure factors have been extracted up to 182(6) GPa showing the presence of two well-defined peaks. A rapid change in the intensity ratio of the two peaks is identified between 145(12) and 151(12) GPa, indicative of a phase change. The noncrystalline diffuse scattering is consistent with shock amorphization of Fe2O3 between 122(3) and 145(12) GPa, followed by an amorphous-to-liquid transition above 151(12) GPa. Upon release, a noncrystalline phase is observed alongside crystalline α−Fe2O3. The extracted structure factor and pair distribution function of this release phase resemble those reported for Fe2O3 melt at ambient pressure. Published by the American Physical Society2025
{"title":"Shock-driven amorphization and melting in Fe2O3","authors":"Céline Crépisson, Alexis Amouretti, Marion Harmand, Chrystèle Sanloup, Patrick Heighway, Sam Azadi, David McGonegle, Thomas Campbell, Juan Pintor, David Alexander Chin, Ethan Smith, Linda Hansen, Alessandro Forte, Thomas Gawne, Hae Ja Lee, Bob Nagler, YuanFeng Shi, Guillaume Fiquet, François Guyot, Mikako Makita, Alessandra Benuzzi-Mounaix, Tommaso Vinci, Kohei Miyanishi, Norimasa Ozaki, Tatiana Pikuz, Hirotaka Nakamura, Keiichi Sueda, Toshinori Yabuuchi, Makina Yabashi, Justin S. Wark, Danae N. Polsin, Sam M. Vinko","doi":"10.1103/physrevb.111.024209","DOIUrl":"https://doi.org/10.1103/physrevb.111.024209","url":null,"abstract":"We present measurements on Fe</a:mi>2</a:mn></a:msub>O</a:mi>3</a:mn></a:msub></a:mrow></a:math> amorphization and melt under laser-driven shock compression up to 209(10) GPa via time-resolved x-ray diffraction. At 122(3) GPa, a diffuse signal is observed indicating the presence of a noncrystalline phase. Structure factors have been extracted up to 182(6) GPa showing the presence of two well-defined peaks. A rapid change in the intensity ratio of the two peaks is identified between 145(12) and 151(12) GPa, indicative of a phase change. The noncrystalline diffuse scattering is consistent with shock amorphization of <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:msub><c:mi>Fe</c:mi><c:mn>2</c:mn></c:msub><c:msub><c:mi mathvariant=\"normal\">O</c:mi><c:mn>3</c:mn></c:msub></c:mrow></c:math> between 122(3) and 145(12) GPa, followed by an amorphous-to-liquid transition above 151(12) GPa. Upon release, a noncrystalline phase is observed alongside crystalline <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mrow><e:mi>α</e:mi><e:mtext>−</e:mtext><e:msub><e:mi>Fe</e:mi><e:mn>2</e:mn></e:msub><e:msub><e:mi mathvariant=\"normal\">O</e:mi><e:mn>3</e:mn></e:msub></e:mrow></e:math>. The extracted structure factor and pair distribution function of this release phase resemble those reported for <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\"><g:mrow><g:msub><g:mi>Fe</g:mi><g:mn>2</g:mn></g:msub><g:msub><g:mi mathvariant=\"normal\">O</g:mi><g:mn>3</g:mn></g:msub></g:mrow></g:math> melt at ambient pressure. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"27 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-29DOI: 10.1103/physrevb.111.045162
P. Khanenko, D. Hafner, K. Semeniuk, J. Banda, T. Lühmann, F. Bärtl, T. Kotte, J. Wosnitza, G. Zwicknagl, C. Geibel, J. F. Landaeta, S. Khim, E. Hassinger, M. Brando
Unconventional superconductivity in heavy-fermion systems appears often near magnetic quantum critical points (QCPs). This seems to be the case also for CeRh</a:mi>2</a:mn></a:msub>As</a:mi>2</a:mn></a:msub></a:mrow></a:math> (<b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:msub><b:mi>T</b:mi><b:mtext>c</b:mtext></b:msub><b:mo> </b:mo><b:mo>≈</b:mo><b:mn>0.31</b:mn></b:math> K). <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:msub><c:mi>CeRh</c:mi><c:mn>2</c:mn></c:msub><c:msub><c:mi>As</c:mi><c:mn>2</c:mn></c:msub></c:mrow></c:math> shows two superconducting (SC) phases, SC1 and SC2, for a magnetic field along the <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"><d:mi>c</d:mi></d:math> axis of the tetragonal unit cell, but only the SC1 phase is observed for a field along the basal plane. Furthermore, another ordered state (phase I) is observed below <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"><e:mrow><e:msub><e:mi>T</e:mi><e:mn>0</e:mn></e:msub><e:mo>≈</e:mo><e:mn>0.48</e:mn><e:mspace width="0.16em"/><e:mi mathvariant="normal">K</e:mi></e:mrow></e:math> whose nature is still unclear: Thermodynamic and magnetic measurements pointed to a nonmagnetic multipolar state, but recent <h:math xmlns:h="http://www.w3.org/1998/Math/MathML"><h:mrow><h:mi>µ</h:mi><h:mi>SR</h:mi></h:mrow></h:math> and nuclear quadrupole resonance/nuclear magnetic resonance (NMR) experiments have clearly detected antiferromagnetic (AFM) order below <i:math xmlns:i="http://www.w3.org/1998/Math/MathML"><i:msub><i:mi>T</i:mi><i:mtext>0</i:mtext></i:msub></i:math>. Also, quasi-two-dimensional AFM fluctuations were observed in NMR and neutron-scattering experiments above <j:math xmlns:j="http://www.w3.org/1998/Math/MathML"><j:msub><j:mi>T</j:mi><j:mtext>0</j:mtext></j:msub></j:math>. The proximity of a QCP is indicated by non-Fermi-liquid (NFL) behavior observed above the ordered states in both specific heat <k:math xmlns:k="http://www.w3.org/1998/Math/MathML"><k:mrow><k:mi>C</k:mi><k:mrow><k:mo>(</k:mo><k:mi>T</k:mi><k:mo>)</k:mo></k:mrow><k:mo>/</k:mo><k:mi>T</k:mi><k:mo>∝</k:mo><k:msup><k:mi>T</k:mi><k:mrow><k:mo>−</k:mo><k:mn>0.6</k:mn></k:mrow></k:msup></k:mrow></k:math> and resistivity <l:math xmlns:l="http://www.w3.org/1998/Math/MathML"><l:mrow><l:mi>ρ</l:mi><l:mrow><l:mo>(</l:mo><l:mi>T</l:mi><l:mo>)</l:mo></l:mrow><l:mo>∝</l:mo><l:msqrt><l:mi>T</l:mi></l:msqrt></l:mrow></l:math>. These <m:math xmlns:m="http://www.w3.org/1998/Math/MathML"><m:mi>T</m:mi></m:math> dependencies are not compatible with any generic AFM QCP. Because of the strong magnetic-field anisotropy of both the SC phase and phase I, it is possible to study a field-induced SC QCP as well as a phase-I QCP by varying the angle <n:math xmlns:n="http://www.w3.org/1998/Math/MathML"><n:mi>α</n:mi></n:math> between the field and the <o:math xmlns:o="http://www.w3.org/1998/Math/MathML"><o:mi>c</o:mi></o:math> axis. Thus, by examining the behavior of the electronic specific-heat co
{"title":"Origin of the non-Fermi-liquid behavior in CeRh2As2","authors":"P. Khanenko, D. Hafner, K. Semeniuk, J. Banda, T. Lühmann, F. Bärtl, T. Kotte, J. Wosnitza, G. Zwicknagl, C. Geibel, J. F. Landaeta, S. Khim, E. Hassinger, M. Brando","doi":"10.1103/physrevb.111.045162","DOIUrl":"https://doi.org/10.1103/physrevb.111.045162","url":null,"abstract":"Unconventional superconductivity in heavy-fermion systems appears often near magnetic quantum critical points (QCPs). This seems to be the case also for CeRh</a:mi>2</a:mn></a:msub>As</a:mi>2</a:mn></a:msub></a:mrow></a:math> (<b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:msub><b:mi>T</b:mi><b:mtext>c</b:mtext></b:msub><b:mo> </b:mo><b:mo>≈</b:mo><b:mn>0.31</b:mn></b:math> K). <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:msub><c:mi>CeRh</c:mi><c:mn>2</c:mn></c:msub><c:msub><c:mi>As</c:mi><c:mn>2</c:mn></c:msub></c:mrow></c:math> shows two superconducting (SC) phases, SC1 and SC2, for a magnetic field along the <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\"><d:mi>c</d:mi></d:math> axis of the tetragonal unit cell, but only the SC1 phase is observed for a field along the basal plane. Furthermore, another ordered state (phase I) is observed below <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mrow><e:msub><e:mi>T</e:mi><e:mn>0</e:mn></e:msub><e:mo>≈</e:mo><e:mn>0.48</e:mn><e:mspace width=\"0.16em\"/><e:mi mathvariant=\"normal\">K</e:mi></e:mrow></e:math> whose nature is still unclear: Thermodynamic and magnetic measurements pointed to a nonmagnetic multipolar state, but recent <h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\"><h:mrow><h:mi>µ</h:mi><h:mi>SR</h:mi></h:mrow></h:math> and nuclear quadrupole resonance/nuclear magnetic resonance (NMR) experiments have clearly detected antiferromagnetic (AFM) order below <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\"><i:msub><i:mi>T</i:mi><i:mtext>0</i:mtext></i:msub></i:math>. Also, quasi-two-dimensional AFM fluctuations were observed in NMR and neutron-scattering experiments above <j:math xmlns:j=\"http://www.w3.org/1998/Math/MathML\"><j:msub><j:mi>T</j:mi><j:mtext>0</j:mtext></j:msub></j:math>. The proximity of a QCP is indicated by non-Fermi-liquid (NFL) behavior observed above the ordered states in both specific heat <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\"><k:mrow><k:mi>C</k:mi><k:mrow><k:mo>(</k:mo><k:mi>T</k:mi><k:mo>)</k:mo></k:mrow><k:mo>/</k:mo><k:mi>T</k:mi><k:mo>∝</k:mo><k:msup><k:mi>T</k:mi><k:mrow><k:mo>−</k:mo><k:mn>0.6</k:mn></k:mrow></k:msup></k:mrow></k:math> and resistivity <l:math xmlns:l=\"http://www.w3.org/1998/Math/MathML\"><l:mrow><l:mi>ρ</l:mi><l:mrow><l:mo>(</l:mo><l:mi>T</l:mi><l:mo>)</l:mo></l:mrow><l:mo>∝</l:mo><l:msqrt><l:mi>T</l:mi></l:msqrt></l:mrow></l:math>. These <m:math xmlns:m=\"http://www.w3.org/1998/Math/MathML\"><m:mi>T</m:mi></m:math> dependencies are not compatible with any generic AFM QCP. Because of the strong magnetic-field anisotropy of both the SC phase and phase I, it is possible to study a field-induced SC QCP as well as a phase-I QCP by varying the angle <n:math xmlns:n=\"http://www.w3.org/1998/Math/MathML\"><n:mi>α</n:mi></n:math> between the field and the <o:math xmlns:o=\"http://www.w3.org/1998/Math/MathML\"><o:mi>c</o:mi></o:math> axis. Thus, by examining the behavior of the electronic specific-heat co","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"74 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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