Pub Date : 2025-03-21DOI: 10.1103/physrevb.111.094522
Krishnan Ganesh, Derek K. K. Lee, Jiannis K. Pachos
We investigate the magnetic characteristics and tunneling signatures of a planar Josephson junction with Rashba spin-orbit coupling during the fusion of two Majorana vortices. By employing the topological phase diagram and conducting tight-binding simulations of the proposed device, we demonstrate that this fusion process induces a parity-dependent magnetic moment aligned with the junction axis. We further propose a method to probe the spin properties of the fusing Majorana zero modes through spin-resolved Andreev conductance measurements at the junction endpoints. To support our findings, we derive a low-energy effective Hamiltonian that provides a detailed microscopic description of the numerically observed phenomena. Our analysis enables the detection of Majorana fusion outcome from accessible spin current measurements, thus paving the way for future experimental verification and potential applications in topological quantum computation. Published by the American Physical Society2025
{"title":"Spin-dependent signatures of Majorana vortex fusion within planar Josephson junctions","authors":"Krishnan Ganesh, Derek K. K. Lee, Jiannis K. Pachos","doi":"10.1103/physrevb.111.094522","DOIUrl":"https://doi.org/10.1103/physrevb.111.094522","url":null,"abstract":"We investigate the magnetic characteristics and tunneling signatures of a planar Josephson junction with Rashba spin-orbit coupling during the fusion of two Majorana vortices. By employing the topological phase diagram and conducting tight-binding simulations of the proposed device, we demonstrate that this fusion process induces a parity-dependent magnetic moment aligned with the junction axis. We further propose a method to probe the spin properties of the fusing Majorana zero modes through spin-resolved Andreev conductance measurements at the junction endpoints. To support our findings, we derive a low-energy effective Hamiltonian that provides a detailed microscopic description of the numerically observed phenomena. Our analysis enables the detection of Majorana fusion outcome from accessible spin current measurements, thus paving the way for future experimental verification and potential applications in topological quantum computation. <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":"23 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143672326","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 : 2025-03-20DOI: 10.1103/physrevb.111.094427
Dror Yahav, Ariel Maniv, Daniel Potashnikov, Asaf Pesach, El'ad N. Caspi, Arneil P. Reyes, Quanzheng Tao, Johanna Rosén, Eran Maniv
We uncover a high-field magnetic phase in i-MAX compounds exhibiting a canted antiferromagnetic order with unprecedented properties, revealed through NMR and AC susceptibility. Intriguingly, as the atomic number of rare earth increases, the transition field of this canted antiferromagnetic phase grows at the expense of the lower-field antiferromagnetic state. Our findings point to the complexity of the magnetic structure in i-MAX compounds, demonstrating a nontrivial evolution of their phase diagram while increasing both the atomic number of the rare-earth element and the external field. Published by the American Physical Society2025
{"title":"Hidden magnetic phases in i -MAX compounds","authors":"Dror Yahav, Ariel Maniv, Daniel Potashnikov, Asaf Pesach, El'ad N. Caspi, Arneil P. Reyes, Quanzheng Tao, Johanna Rosén, Eran Maniv","doi":"10.1103/physrevb.111.094427","DOIUrl":"https://doi.org/10.1103/physrevb.111.094427","url":null,"abstract":"We uncover a high-field magnetic phase in i</a:mi></a:mrow></a:math>-MAX compounds exhibiting a canted antiferromagnetic order with unprecedented properties, revealed through NMR and AC susceptibility. Intriguingly, as the atomic number of rare earth increases, the transition field of this canted antiferromagnetic phase grows at the expense of the lower-field antiferromagnetic state. Our findings point to the complexity of the magnetic structure in <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mrow><b:mi>i</b:mi></b:mrow></b:math>-MAX compounds, demonstrating a nontrivial evolution of their phase diagram while increasing both the atomic number of the rare-earth element and the external field. <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":"22 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143666687","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 : 2025-03-20DOI: 10.1103/physrevb.111.117302
B. P. Reed, M. E. Bathen, J. W. R. Ash, C. J. Meara, A. A. Zakharov, J. P. Goss, J. W. Wells, D. A. Evans, S. P. Cooil
In the Comment by Goletti [], concerns are raised regarding the interpretation of our experimental findings, as well as the application of basic ground-state density functional theory (DFT) models pertaining to the C(111)−(2×1) surface presented in our earlier publication [Reed , ]. These concerns are addressed and our interpretation of the results is ultimately reconfirmed. We present further analysis of the original data and introduce new measurements on previously unreported regions of the surface reconstructed (2×1) Brillouin zone, aiding in the evaluation of the dispersion relation at other high-symmetry points. We gain insights relating to the current use of DFT calculations that include many-body theories when relating to the occupied electronic structure of this surface as measured by angle-resolved photoelectron spectroscopy. Published by the American Physical Society2025
{"title":"Reply to “Comment on “Diamond (111) surface reconstruction and epitaxial graphene interface””","authors":"B. P. Reed, M. E. Bathen, J. W. R. Ash, C. J. Meara, A. A. Zakharov, J. P. Goss, J. W. Wells, D. A. Evans, S. P. Cooil","doi":"10.1103/physrevb.111.117302","DOIUrl":"https://doi.org/10.1103/physrevb.111.117302","url":null,"abstract":"In the Comment by Goletti [], concerns are raised regarding the interpretation of our experimental findings, as well as the application of basic ground-state density functional theory (DFT) models pertaining to the C</a:mi>(</a:mo>111</a:mn>)</a:mo>−</a:mtext>(</a:mo>2</a:mn>×</a:mo>1</a:mn>)</a:mo></a:mrow></a:mrow></a:math> surface presented in our earlier publication [Reed , ]. These concerns are addressed and our interpretation of the results is ultimately reconfirmed. We present further analysis of the original data and introduce new measurements on previously unreported regions of the surface reconstructed (<c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:mn>2</c:mn><c:mo>×</c:mo><c:mn>1</c:mn></c:mrow></c:math>) Brillouin zone, aiding in the evaluation of the dispersion relation at other high-symmetry points. We gain insights relating to the current use of DFT calculations that include many-body theories when relating to the occupied electronic structure of this surface as measured by angle-resolved photoelectron spectroscopy. <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":"183 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143666690","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 : 2025-03-20DOI: 10.1103/physrevb.111.125146
Andreas Gebauer, Tillmann Schabbehard, Luis Maschmann, Walter Pfeiffer
Attosecond time-resolved photoelectron spectroscopy reveals photoemission dynamics, for example, via reconstruction of attosecond beating by interference of two-photon transitions (RABBITT). However, the multitude of photoemission peaks in a RABBITT spectrogram often limits the applicability of the method to well-separated photoemission channels. Here, we derive relations between RABBITT oscillations of sidebands and principal bands within strong field approximation. This allows extracting timing information on the photoemission dynamics for rather convoluted RABBITT spectra, for which the common analysis would fail. This improvement is demonstrated for simulated overlapping RABBITT spectrograms based on a solid-state photoemission model showing the robust reconstruction of the individual photoemission delays. Published by the American Physical Society2025
{"title":"Disentanglement of overlapping spectrograms in attosecond time-resolved photoelectron spectroscopy of solids","authors":"Andreas Gebauer, Tillmann Schabbehard, Luis Maschmann, Walter Pfeiffer","doi":"10.1103/physrevb.111.125146","DOIUrl":"https://doi.org/10.1103/physrevb.111.125146","url":null,"abstract":"Attosecond time-resolved photoelectron spectroscopy reveals photoemission dynamics, for example, via reconstruction of attosecond beating by interference of two-photon transitions (RABBITT). However, the multitude of photoemission peaks in a RABBITT spectrogram often limits the applicability of the method to well-separated photoemission channels. Here, we derive relations between RABBITT oscillations of sidebands and principal bands within strong field approximation. This allows extracting timing information on the photoemission dynamics for rather convoluted RABBITT spectra, for which the common analysis would fail. This improvement is demonstrated for simulated overlapping RABBITT spectrograms based on a solid-state photoemission model showing the robust reconstruction of the individual photoemission delays. <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":"61 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143666688","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 : 2025-03-18DOI: 10.1103/physrevb.111.l121106
Banhi Chatterjee, Jernej Mravlje, Denis Golež
We explore the collective response in an excitonic insulator phase in Ta2NiSe5 using a semirealistic model including relevant lattice and electronic instabilities. We calculate order-parameter susceptibility and Raman response within a time-dependent Hartree-Fock approach. Contrary to the standard expectations, the amplitude mode frequency does not coincide with the single-particle gap but has a higher frequency. We find a phase mode that is massive because the excitonic condensation breaks a discrete symmetry only and that becomes heavier as the electron-lattice coupling is increased. These features are expected to apply to generic realistic excitonic insulators. We discuss scenarios under which the phase mode does not appear as a sharp in-gap resonance. Published by the American Physical Society2025
{"title":"Collective modes and Raman response in Ta2NiSe5","authors":"Banhi Chatterjee, Jernej Mravlje, Denis Golež","doi":"10.1103/physrevb.111.l121106","DOIUrl":"https://doi.org/10.1103/physrevb.111.l121106","url":null,"abstract":"We explore the collective response in an excitonic insulator phase in Ta</a:mi>2</a:mn></a:msub>NiSe</a:mi>5</a:mn></a:msub></a:mrow></a:math> using a semirealistic model including relevant lattice and electronic instabilities. We calculate order-parameter susceptibility and Raman response within a time-dependent Hartree-Fock approach. Contrary to the standard expectations, the amplitude mode frequency does not coincide with the single-particle gap but has a higher frequency. We find a phase mode that is massive because the excitonic condensation breaks a discrete symmetry only and that becomes heavier as the electron-lattice coupling is increased. These features are expected to apply to generic realistic excitonic insulators. We discuss scenarios under which the phase mode does not appear as a sharp in-gap resonance. <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":"13 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143653780","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 : 2025-03-17DOI: 10.1103/physrevb.111.125137
Gökmen Polat, Eric Jeckelmann
We investigate the Emery model on several ladder-like lattices including two legs of copper d orbitals and various numbers of oxygen p orbitals. Pair binding energy, pair spatial structure, density distribution, and pairing correlation functions are calculated using the density-matrix renormalization group (DMRG). We show that a Luther-Emery phase with enhanced pairing correlations can be found for hole doping as well as for electron doping with realistic model parameters. Ladder properties depend sensitively on model parameters, the oxygen p orbitals taken into account, and boundary conditions. The pair binding energy is a more reliable quantity than correlation functions for ascertaining the occurrence of pairing in ladders. Overall, our results for two-leg Emery ladders support the possibility of superconductivity in the hole-doped 2D model. The issue is rather to determine which of the various ladder structures and model parameters are appropriate to approximate the two-dimensional cuprates. Published by the American Physical Society2025
{"title":"Influence of oxygen orbitals and boundary conditions on the pairing behavior in the Emery model for doped ladders","authors":"Gökmen Polat, Eric Jeckelmann","doi":"10.1103/physrevb.111.125137","DOIUrl":"https://doi.org/10.1103/physrevb.111.125137","url":null,"abstract":"We investigate the Emery model on several ladder-like lattices including two legs of copper d</a:mi></a:math> orbitals and various numbers of oxygen <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mi>p</b:mi></b:math> orbitals. Pair binding energy, pair spatial structure, density distribution, and pairing correlation functions are calculated using the density-matrix renormalization group (DMRG). We show that a Luther-Emery phase with enhanced pairing correlations can be found for hole doping as well as for electron doping with realistic model parameters. Ladder properties depend sensitively on model parameters, the oxygen <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mi>p</c:mi></c:math> orbitals taken into account, and boundary conditions. The pair binding energy is a more reliable quantity than correlation functions for ascertaining the occurrence of pairing in ladders. Overall, our results for two-leg Emery ladders support the possibility of superconductivity in the hole-doped 2D model. The issue is rather to determine which of the various ladder structures and model parameters are appropriate to approximate the two-dimensional cuprates. <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":"34 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640377","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 : 2025-03-17DOI: 10.1103/physrevb.111.125141
Gunnar Bollmark, Thomas Köhler, Adrian Kantian
Materials with strong electronic correlations often exhibit a superconducting phase in close competition with other insulating phases, which is outstandingly difficult to resolve, e.g., for a group of quasi-two-dimensional (Q2D) materials such as the cuprates, even for the simplified minimal model of these materials, the doped 2D Hubbard model. The present work shows how quasi-one-dimensional (Q1D) systems, 2D and three-dimensional (3D) arrays of weakly coupled 1D correlated electrons, are much more amenable to resolving such competition, treating both instabilities on equal footing. Using the recently established matrix product state plus mean field (MPS+MF) approach for fermions [Bollmark , ], we demonstrate that large systems can be reached readily in these systems, which opens up the thermodynamic regime via extrapolation. Focusing on basic model systems, 3D arrays of negative-U Hubbard chains with additional nearest-neighbor interaction V, we show that despite the MF component of the MPS+MF technique, we can reproduce the expected coexistence of the superconductivity and charge density wave at V=0 for density n=1. We then show how we can tune away from coexistence by both tuning V and doping the system. This work thus paves the way to deploy two-channel MPS+MF theory on some highly demanding high-Tc superconducting systems, such as 3D arrays of repulsive-U doped Hubbard ladders; we recently characterized the properties of such arrays in single-channel MPS+MF calculations [Bollmark , ]. Published by the American Physical Society2025
{"title":"Resolving competition of charge density wave and superconducting phases using the matrix product state plus mean field algorithm","authors":"Gunnar Bollmark, Thomas Köhler, Adrian Kantian","doi":"10.1103/physrevb.111.125141","DOIUrl":"https://doi.org/10.1103/physrevb.111.125141","url":null,"abstract":"Materials with strong electronic correlations often exhibit a superconducting phase in close competition with other insulating phases, which is outstandingly difficult to resolve, e.g., for a group of quasi-two-dimensional (Q2D) materials such as the cuprates, even for the simplified minimal model of these materials, the doped 2D Hubbard model. The present work shows how quasi-one-dimensional (Q1D) systems, 2D and three-dimensional (3D) arrays of weakly coupled 1D correlated electrons, are much more amenable to resolving such competition, treating both instabilities on equal footing. Using the recently established matrix product state plus mean field (</a:mo>MPS</a:mi>+</a:mo>MF</a:mi>)</a:mo></a:math> approach for fermions [Bollmark , ], we demonstrate that large systems can be reached readily in these systems, which opens up the thermodynamic regime via extrapolation. Focusing on basic model systems, 3D arrays of negative-<b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mi>U</b:mi></b:math> Hubbard chains with additional nearest-neighbor interaction <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mi>V</c:mi></c:math>, we show that despite the MF component of the <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\"><d:mi>MPS</d:mi><d:mo>+</d:mo><d:mi>MF</d:mi></d:math> technique, we can reproduce the expected coexistence of the superconductivity and charge density wave at <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mrow><e:mi>V</e:mi><e:mo>=</e:mo><e:mn>0</e:mn></e:mrow></e:math> for density <f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\"><f:mrow><f:mi>n</f:mi><f:mo>=</f:mo><f:mn>1</f:mn></f:mrow></f:math>. We then show how we can tune away from coexistence by both tuning <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\"><g:mi>V</g:mi></g:math> and doping the system. This work thus paves the way to deploy two-channel <h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\"><h:mi>MPS</h:mi><h:mo>+</h:mo><h:mi>MF</h:mi></h:math> theory on some highly demanding high-<i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\"><i:msub><i:mi>T</i:mi><i:mi>c</i:mi></i:msub></i:math> superconducting systems, such as 3D arrays of repulsive-<j:math xmlns:j=\"http://www.w3.org/1998/Math/MathML\"><j:mi>U</j:mi></j:math> doped Hubbard ladders; we recently characterized the properties of such arrays in single-channel <k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\"><k:mi>MPS</k:mi><k:mo>+</k:mo><k:mi>MF</k:mi></k:math> calculations [Bollmark , ]. <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":"7 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640374","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 : 2025-03-17DOI: 10.1103/physrevb.111.104507
Rustem Khasanov, Riccardo Vocaturo, Oleg Janson, Andreas Koitzsch, Ritu Gupta, Debarchan Das, Nicola P. M. Casati, Maia G. Vergniory, Jeroen van den Brink, Eteri Svanidze
We report on studies of the superconducting and normal-state properties of the noncentrosymmetric superconductor BeAu under hydrostatic pressure conditions. The room-temperature equation of state (EOS) reveals the values of the bulk modulus (B</a:mi>0</a:mn></a:msub></a:math>) and its first derivative (<b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:msubsup><b:mi>B</b:mi><b:mn>0</b:mn><b:mo>′</b:mo></b:msubsup></b:math>) at ambient pressure to be <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:msub><c:mi>B</c:mi><c:mn>0</c:mn></c:msub><c:mo>≃</c:mo><c:mn>133</c:mn><c:mspace width="0.28em"/><c:mi>GPa</c:mi></c:mrow></c:math> and <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"><e:mrow><e:msubsup><e:mi>B</e:mi><e:mn>0</e:mn><e:mo>′</e:mo></e:msubsup><e:mo>≃</e:mo><e:mn>30</e:mn></e:mrow></e:math>, respectively. Up to the highest pressures studied (<f:math xmlns:f="http://www.w3.org/1998/Math/MathML"><f:mrow><f:mi>p</f:mi><f:mo>≃</f:mo><f:mn>2.2</f:mn><f:mspace width="0.28em"/><f:mi>GPa</f:mi></f:mrow></f:math>), BeAu remains a multigap type-I superconductor. The analysis of <h:math xmlns:h="http://www.w3.org/1998/Math/MathML"><h:mrow><h:msub><h:mi>B</h:mi><h:mi mathvariant="normal">c</h:mi></h:msub><h:mrow><h:mo>(</h:mo><h:mi>T</h:mi><h:mo>,</h:mo><h:mi>p</h:mi><h:mo>)</h:mo></h:mrow></h:mrow></h:math> data within the self-consistent two-gap approach suggests the presence of two superconducting energy gaps, with the gap-to-<j:math xmlns:j="http://www.w3.org/1998/Math/MathML"><j:msub><j:mi>T</j:mi><j:mi mathvariant="normal">c</j:mi></j:msub></j:math> ratios <l:math xmlns:l="http://www.w3.org/1998/Math/MathML"><l:mrow><l:msub><l:mi mathvariant="normal">Δ</l:mi><l:mn>1</l:mn></l:msub><l:mo>/</l:mo><l:msub><l:mi>k</l:mi><l:mi mathvariant="normal">B</l:mi></l:msub><l:msub><l:mi>T</l:mi><l:mi mathvariant="normal">c</l:mi></l:msub><l:mo>∼</l:mo><l:mn>2.3</l:mn></l:mrow></l:math> and <p:math xmlns:p="http://www.w3.org/1998/Math/MathML"><p:mrow><p:msub><p:mi mathvariant="normal">Δ</p:mi><p:mn>2</p:mn></p:msub><p:mo>/</p:mo><p:msub><p:mi>k</p:mi><p:mi mathvariant="normal">B</p:mi></p:msub><p:msub><p:mi>T</p:mi><p:mi mathvariant="normal">c</p:mi></p:msub><p:mo>∼</p:mo><p:mn>1.1</p:mn></p:mrow></p:math> for the larger and smaller gaps, respectively [<t:math xmlns:t="http://www.w3.org/1998/Math/MathML"><t:mrow><t:mi mathvariant="normal">Δ</t:mi><t:mo>=</t:mo><t:mi mathvariant="normal">Δ</t:mi><t:mo>(</t:mo><t:mn>0</t:mn><t:mo>)</t:mo></t:mrow></t:math> is the zero-temperature value of the gap and <w:math xmlns:w="http://www.w3.org/1998/Math/MathML"><w:msub><w:mi>k</w:mi><w:mi mathvariant="normal">B</w:mi></w:msub></w:math> is the Boltzmann constant]. With increasing pressure, <y:math xmlns:y="http://www.w3.org/1998/Math/MathML"><y:mrow><y:msub><y:mi mathvariant="normal">Δ</y:mi><y:mn>1</y:mn></y:msub><y:mo>/</y:mo><y:msub><y:mi>k</y:mi><y:mi mathvariant="normal">B</y:mi></y:msub><y:msub><y:mi>T</y:mi><y:mi mathvariant="normal">c</y:m
{"title":"Influence of pressure on the properties of the multigap type-I superconductor BeAu","authors":"Rustem Khasanov, Riccardo Vocaturo, Oleg Janson, Andreas Koitzsch, Ritu Gupta, Debarchan Das, Nicola P. M. Casati, Maia G. Vergniory, Jeroen van den Brink, Eteri Svanidze","doi":"10.1103/physrevb.111.104507","DOIUrl":"https://doi.org/10.1103/physrevb.111.104507","url":null,"abstract":"We report on studies of the superconducting and normal-state properties of the noncentrosymmetric superconductor BeAu under hydrostatic pressure conditions. The room-temperature equation of state (EOS) reveals the values of the bulk modulus (B</a:mi>0</a:mn></a:msub></a:math>) and its first derivative (<b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:msubsup><b:mi>B</b:mi><b:mn>0</b:mn><b:mo>′</b:mo></b:msubsup></b:math>) at ambient pressure to be <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:msub><c:mi>B</c:mi><c:mn>0</c:mn></c:msub><c:mo>≃</c:mo><c:mn>133</c:mn><c:mspace width=\"0.28em\"/><c:mi>GPa</c:mi></c:mrow></c:math> and <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mrow><e:msubsup><e:mi>B</e:mi><e:mn>0</e:mn><e:mo>′</e:mo></e:msubsup><e:mo>≃</e:mo><e:mn>30</e:mn></e:mrow></e:math>, respectively. Up to the highest pressures studied (<f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\"><f:mrow><f:mi>p</f:mi><f:mo>≃</f:mo><f:mn>2.2</f:mn><f:mspace width=\"0.28em\"/><f:mi>GPa</f:mi></f:mrow></f:math>), BeAu remains a multigap type-I superconductor. The analysis of <h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\"><h:mrow><h:msub><h:mi>B</h:mi><h:mi mathvariant=\"normal\">c</h:mi></h:msub><h:mrow><h:mo>(</h:mo><h:mi>T</h:mi><h:mo>,</h:mo><h:mi>p</h:mi><h:mo>)</h:mo></h:mrow></h:mrow></h:math> data within the self-consistent two-gap approach suggests the presence of two superconducting energy gaps, with the gap-to-<j:math xmlns:j=\"http://www.w3.org/1998/Math/MathML\"><j:msub><j:mi>T</j:mi><j:mi mathvariant=\"normal\">c</j:mi></j:msub></j:math> ratios <l:math xmlns:l=\"http://www.w3.org/1998/Math/MathML\"><l:mrow><l:msub><l:mi mathvariant=\"normal\">Δ</l:mi><l:mn>1</l:mn></l:msub><l:mo>/</l:mo><l:msub><l:mi>k</l:mi><l:mi mathvariant=\"normal\">B</l:mi></l:msub><l:msub><l:mi>T</l:mi><l:mi mathvariant=\"normal\">c</l:mi></l:msub><l:mo>∼</l:mo><l:mn>2.3</l:mn></l:mrow></l:math> and <p:math xmlns:p=\"http://www.w3.org/1998/Math/MathML\"><p:mrow><p:msub><p:mi mathvariant=\"normal\">Δ</p:mi><p:mn>2</p:mn></p:msub><p:mo>/</p:mo><p:msub><p:mi>k</p:mi><p:mi mathvariant=\"normal\">B</p:mi></p:msub><p:msub><p:mi>T</p:mi><p:mi mathvariant=\"normal\">c</p:mi></p:msub><p:mo>∼</p:mo><p:mn>1.1</p:mn></p:mrow></p:math> for the larger and smaller gaps, respectively [<t:math xmlns:t=\"http://www.w3.org/1998/Math/MathML\"><t:mrow><t:mi mathvariant=\"normal\">Δ</t:mi><t:mo>=</t:mo><t:mi mathvariant=\"normal\">Δ</t:mi><t:mo>(</t:mo><t:mn>0</t:mn><t:mo>)</t:mo></t:mrow></t:math> is the zero-temperature value of the gap and <w:math xmlns:w=\"http://www.w3.org/1998/Math/MathML\"><w:msub><w:mi>k</w:mi><w:mi mathvariant=\"normal\">B</w:mi></w:msub></w:math> is the Boltzmann constant]. With increasing pressure, <y:math xmlns:y=\"http://www.w3.org/1998/Math/MathML\"><y:mrow><y:msub><y:mi mathvariant=\"normal\">Δ</y:mi><y:mn>1</y:mn></y:msub><y:mo>/</y:mo><y:msub><y:mi>k</y:mi><y:mi mathvariant=\"normal\">B</y:mi></y:msub><y:msub><y:mi>T</y:mi><y:mi mathvariant=\"normal\">c</y:m","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"124 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143635189","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 : 2025-03-17DOI: 10.1103/physrevb.111.104421
Sebastian Sailler, Giacomo Sala, Denise Reustlen, Richard Schlitz, Min-Gu Kang, Pietro Gambardella, Sebastian T. B. Goennenwein, Michaela Lammel
One of the key elements in spintronics research is the spin Hall effect, allowing to generate spin currents from charge currents. A large spin Hall effect is observed in materials with strong spin-orbit coupling, e.g., Pt. Recent research suggests the existence of an orbital Hall effect, the orbital analog to the spin Hall effect, which also arises in weakly spin-orbit-coupled materials like Ti, Mn, or Cr. In Pt both effects are predicted to coexist. In any of these materials, a magnetic field perpendicular to the spin or orbital accumulation leads to additional Hanle dephasing and thereby the Hanle magnetoresistance (MR). To reveal the MR behavior of a material with both spin and orbital Hall effect, we first study the MR of Pt thin films over a wide range of thicknesses. Careful evaluation shows that the MR of our textured samples is dominated by the ordinary MR rather than by the Hanle effect. We analyze the intrinsic properties of Pt films deposited by different groups and show that next to the resistivity also the structural properties of the film influence which MR dominates. We further show that this correlation can be found in both spin Hall active materials like Pt and orbital Hall active materials, like Ti. For both materials, we find a large Hanle MR for the samples without apparent structural order, whereas the ordinary MR dominates in the crystalline samples. We then provide a set of rules to distinguish between the ordinary and the Hanle MR. We suggest that in all materials with a spin or orbital Hall effect the Hanle MR and the ordinary MR coexist and the purity, crystallinity, and electronic structure of the thin film determine the dominating effect. Published by the American Physical Society2025
{"title":"Competing ordinary and Hanle magnetoresistance in Pt and Ti thin films","authors":"Sebastian Sailler, Giacomo Sala, Denise Reustlen, Richard Schlitz, Min-Gu Kang, Pietro Gambardella, Sebastian T. B. Goennenwein, Michaela Lammel","doi":"10.1103/physrevb.111.104421","DOIUrl":"https://doi.org/10.1103/physrevb.111.104421","url":null,"abstract":"One of the key elements in spintronics research is the spin Hall effect, allowing to generate spin currents from charge currents. A large spin Hall effect is observed in materials with strong spin-orbit coupling, e.g., Pt. Recent research suggests the existence of an orbital Hall effect, the orbital analog to the spin Hall effect, which also arises in weakly spin-orbit-coupled materials like Ti, Mn, or Cr. In Pt both effects are predicted to coexist. In any of these materials, a magnetic field perpendicular to the spin or orbital accumulation leads to additional Hanle dephasing and thereby the Hanle magnetoresistance (MR). To reveal the MR behavior of a material with both spin and orbital Hall effect, we first study the MR of Pt thin films over a wide range of thicknesses. Careful evaluation shows that the MR of our textured samples is dominated by the ordinary MR rather than by the Hanle effect. We analyze the intrinsic properties of Pt films deposited by different groups and show that next to the resistivity also the structural properties of the film influence which MR dominates. We further show that this correlation can be found in both spin Hall active materials like Pt and orbital Hall active materials, like Ti. For both materials, we find a large Hanle MR for the samples without apparent structural order, whereas the ordinary MR dominates in the crystalline samples. We then provide a set of rules to distinguish between the ordinary and the Hanle MR. We suggest that in all materials with a spin or orbital Hall effect the Hanle MR and the ordinary MR coexist and the purity, crystallinity, and electronic structure of the thin film determine the dominating effect. <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":"9 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143635198","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 : 2025-03-17DOI: 10.1103/physrevb.111.104506
Kateryna Zatsarynna, Andrea Nava, Reinhold Egger, Alex Zazunov
We develop a Green's function approach for the nonequilibrium dynamics of multilevel quantum dots coupled to multiple fermionic reservoirs in the presence of a bosonic environment. Our theory is simpler than the Keldysh approach and goes beyond scattering state constructions. In concrete terms, we study Josephson junctions containing a quantum dot and coupled to an electromagnetic environment. In the dot region, spin-orbit interactions, a Zeeman field, and in principle Coulomb interactions can also be included. We then study quantum Mpemba effects, assuming that the average phase difference across the Josephson junction is subject to a rapid quench. For a short single-channel junction, we show that both types of quantum Mpemba effects allowed in open quantum systems can occur. We also study an intermediate-length junction, where spin-orbit interactions and a Zeeman field are included. Again quantum Mpemba effects are predicted. Published by the American Physical Society2025
{"title":"Green's function approach to Josephson dot dynamics and application to quantum Mpemba effects","authors":"Kateryna Zatsarynna, Andrea Nava, Reinhold Egger, Alex Zazunov","doi":"10.1103/physrevb.111.104506","DOIUrl":"https://doi.org/10.1103/physrevb.111.104506","url":null,"abstract":"We develop a Green's function approach for the nonequilibrium dynamics of multilevel quantum dots coupled to multiple fermionic reservoirs in the presence of a bosonic environment. Our theory is simpler than the Keldysh approach and goes beyond scattering state constructions. In concrete terms, we study Josephson junctions containing a quantum dot and coupled to an electromagnetic environment. In the dot region, spin-orbit interactions, a Zeeman field, and in principle Coulomb interactions can also be included. We then study quantum Mpemba effects, assuming that the average phase difference across the Josephson junction is subject to a rapid quench. For a short single-channel junction, we show that both types of quantum Mpemba effects allowed in open quantum systems can occur. We also study an intermediate-length junction, where spin-orbit interactions and a Zeeman field are included. Again quantum Mpemba effects are predicted. <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":"197 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640376","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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