Oktay Aktas, Francisco Javier Romero, Zhengwang He, Gan Linyu, Xiangdong Ding, José-María Martín-Olalla, Maria-Carmen Gallardo, Turab Lookman
We study the phase transition behavior of the ferroelectric BaTi$_{0.8}$Zr$_{0.2}$O$_3$ in the paraelectric region. The temperature dependencies of thermal, polar, elastic and dielectric properties indicate the presence of local structures above the paraelectric-ferroelectric transition temperature Tc = 292 K. The non-zero remnant polarization is measured up to a characteristic temperature T* ~350 K, which coincides with the temperature where the dielectric constant deviates from Curie-Weiss law. Resonant Piezoelectric Spectroscopy shows that DC field-cooling above Tc using fields smaller than the coercive field leads to an elastic response and remnant piezoelectricity below T*, which likely corresponds to the coherence temperature associated with polar nanostructures in ferroelectrics. The observed remnant effect is attributed to the reorientation of polar nanostructures above Tc.
我们研究了铁电体 BaTi$_{0.8}$Zr$_{0.2}$O$_3$ 在副电区的相变行为。热、极性、弹性和介电性质的温度依赖性表明，在副介电-铁电转变温度 Tc = 292 K 以上存在局部结构。在特征温度 T* ~350 K 以下测量到了非零残余极化，这与介电常数偏离居里-韦斯定律的温度相吻合。共振压电光谱显示，使用小于矫顽力场的场在 Tc 以上进行直流场冷却会导致弹性响应和低于 T* 的残余压电，这可能与铁电中极性纳米结构相关的相干温度一致。所观察到的残余效应归因于极性纳米结构在 Tc 以上的重新定向。
{"title":"Phase transition and polar cluster behavior above Curie temperature in ferroelectric BaTi$_{0.8}$Zr$_{0.2}$O$_3$","authors":"Oktay Aktas, Francisco Javier Romero, Zhengwang He, Gan Linyu, Xiangdong Ding, José-María Martín-Olalla, Maria-Carmen Gallardo, Turab Lookman","doi":"arxiv-2404.19558","DOIUrl":"https://doi.org/arxiv-2404.19558","url":null,"abstract":"We study the phase transition behavior of the ferroelectric\u0000BaTi$_{0.8}$Zr$_{0.2}$O$_3$ in the paraelectric region. The temperature\u0000dependencies of thermal, polar, elastic and dielectric properties indicate the\u0000presence of local structures above the paraelectric-ferroelectric transition\u0000temperature Tc = 292 K. The non-zero remnant polarization is measured up to a\u0000characteristic temperature T* ~350 K, which coincides with the temperature\u0000where the dielectric constant deviates from Curie-Weiss law. Resonant\u0000Piezoelectric Spectroscopy shows that DC field-cooling above Tc using fields\u0000smaller than the coercive field leads to an elastic response and remnant\u0000piezoelectricity below T*, which likely corresponds to the coherence\u0000temperature associated with polar nanostructures in ferroelectrics. The\u0000observed remnant effect is attributed to the reorientation of polar\u0000nanostructures above Tc.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"96 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140826965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. E. Abrão, E. Santos, J. L. Costa, J. G. S. Santos, J. B. S. Mendes, A. Azevedo
We investigate anomalous spin and orbital Hall phenomena in antiferromagnetic (AF) materials via orbital pumping experiments. Conducting spin and orbital pumping experiments on YIG/Pt/Ir20Mn80 heterostructures, we unexpectedly observe strong spin and orbital anomalous signals in an out-of-plane configuration. We report a sevenfold increase in the signal of the anomalous inverse orbital Hall effect (AIOHE) compared to conventional effects. Our study suggests expanding the Orbital Hall angle ({theta}_OH) to a rank 3 tensor, akin to the Spin Hall angle ({theta}_SH), to explain AIOHE. This work pioneers converting spin-orbital currents into charge current, advancing the spin-orbitronics domain in AF materials.
{"title":"Anomalous Spin and Orbital Hall Phenomena in Antiferromagnetic Systems","authors":"J. E. Abrão, E. Santos, J. L. Costa, J. G. S. Santos, J. B. S. Mendes, A. Azevedo","doi":"arxiv-2404.18712","DOIUrl":"https://doi.org/arxiv-2404.18712","url":null,"abstract":"We investigate anomalous spin and orbital Hall phenomena in antiferromagnetic\u0000(AF) materials via orbital pumping experiments. Conducting spin and orbital\u0000pumping experiments on YIG/Pt/Ir20Mn80 heterostructures, we unexpectedly\u0000observe strong spin and orbital anomalous signals in an out-of-plane\u0000configuration. We report a sevenfold increase in the signal of the anomalous\u0000inverse orbital Hall effect (AIOHE) compared to conventional effects. Our study\u0000suggests expanding the Orbital Hall angle ({theta}_OH) to a rank 3 tensor,\u0000akin to the Spin Hall angle ({theta}_SH), to explain AIOHE. This work pioneers\u0000converting spin-orbital currents into charge current, advancing the\u0000spin-orbitronics domain in AF materials.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140826994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. M. Sheverdyaeva, G. Bihlmayer, E. Cappelluti, D. Pacilé, F. Mazzola, N. Atodiresei, M. Jugovac, I. Grimaldi, G. Contini, A. K. Kundu, I. Vobornik, J. Fujii, P. Moras, C. Carbone, L. Ferrari
We present a detailed analysis of the electronic properties of graphene/Eu/Ni(111). By using angle and spin-resolved photoemission spectroscopy and ab initio calculations, we show that the Eu-intercalation of graphene/Ni(111) restores the nearly freestanding dispersion of the $pipi^ast$ Dirac cones at the K point with an additional lifting of the spin degeneracy due to the mixing of graphene and Eu states. The interaction with the magnetic substrate results in a large spin-dependent gap in the Dirac cones with a topological nature characterized by a large Berry curvature, and a spin-polarized van Hove singularity, whose closeness to the Fermi level gives rise to a polaronic band.
我们详细分析了石墨烯/Eu/Ni(111)的电子特性。通过使用角度和自旋分辨光发射光谱以及 ab initio 计算，我们发现石墨烯/Eu/Ni(111)的 Eu 互掺恢复了 K 点的（$/pi/pi^ast/$）狄拉克锥的近乎独立的分散性，同时由于石墨烯和 Eu 态的混合，额外地解除了自旋不均匀性。与磁性基底的相互作用导致了具有拓扑性质的狄拉克锥中的大自旋间隙，其特征是大贝里曲率和spin-polarized van Hove奇异性，其与费米级的接近性产生了极子带。
{"title":"Spin-dependent $π$$π^{ast}$ gap in graphene on a magnetic substrate","authors":"P. M. Sheverdyaeva, G. Bihlmayer, E. Cappelluti, D. Pacilé, F. Mazzola, N. Atodiresei, M. Jugovac, I. Grimaldi, G. Contini, A. K. Kundu, I. Vobornik, J. Fujii, P. Moras, C. Carbone, L. Ferrari","doi":"arxiv-2404.17887","DOIUrl":"https://doi.org/arxiv-2404.17887","url":null,"abstract":"We present a detailed analysis of the electronic properties of\u0000graphene/Eu/Ni(111). By using angle and spin-resolved photoemission\u0000spectroscopy and ab initio calculations, we show that the Eu-intercalation of\u0000graphene/Ni(111) restores the nearly freestanding dispersion of the\u0000$pipi^ast$ Dirac cones at the K point with an additional lifting of the spin\u0000degeneracy due to the mixing of graphene and Eu states. The interaction with\u0000the magnetic substrate results in a large spin-dependent gap in the Dirac cones\u0000with a topological nature characterized by a large Berry curvature, and a\u0000spin-polarized van Hove singularity, whose closeness to the Fermi level gives\u0000rise to a polaronic band.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140827182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We present a machine learning method for swiftly identifying nanobubbles in graphene, crucial for understanding electronic transport in graphene-based devices. Nanobubbles cause local strain, impacting graphene's transport properties. Traditional techniques like optical imaging are slow and limited for characterizing multiple nanobubbles. Our approach uses neural networks to analyze graphene's density of states, enabling rapid detection and characterization of nanobubbles from electronic transport data. This method swiftly enumerates nanobubbles and surpasses conventional imaging methods in efficiency and speed. It enhances quality assessment and optimization of graphene nanodevices, marking a significant advance in condensed matter physics and materials science. Our technique offers an efficient solution for probing the interplay between nanoscale features and electronic properties in two-dimensional materials.
{"title":"Neural network-based recognition of multiple nanobubbles in graphene","authors":"Subin Kim, Nojoon Myoung, Seunghyun Jun, Ara Go","doi":"arxiv-2404.15658","DOIUrl":"https://doi.org/arxiv-2404.15658","url":null,"abstract":"We present a machine learning method for swiftly identifying nanobubbles in\u0000graphene, crucial for understanding electronic transport in graphene-based\u0000devices. Nanobubbles cause local strain, impacting graphene's transport\u0000properties. Traditional techniques like optical imaging are slow and limited\u0000for characterizing multiple nanobubbles. Our approach uses neural networks to\u0000analyze graphene's density of states, enabling rapid detection and\u0000characterization of nanobubbles from electronic transport data. This method\u0000swiftly enumerates nanobubbles and surpasses conventional imaging methods in\u0000efficiency and speed. It enhances quality assessment and optimization of\u0000graphene nanodevices, marking a significant advance in condensed matter physics\u0000and materials science. Our technique offers an efficient solution for probing\u0000the interplay between nanoscale features and electronic properties in\u0000two-dimensional materials.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. David Hinostroza, Leandro Rodrigues de Faria, Gustavo H. Cassemiro, J. Larrea Jiménez, Antonio Jefferson da Silva Machado, Walber H. Brito, Valentina Martelli
The bismuth-halide Bi$_4$I$_4$ undergoes a structural transition around $T_Psim 300$K, which separates a high-temperature $beta$ phase ($T>T_P$) from a low-temperature $alpha$ phase ($T
{"title":"Structural investigation of the quasi-one-dimensional topological insulator Bi$_4$I$_4$","authors":"C. David Hinostroza, Leandro Rodrigues de Faria, Gustavo H. Cassemiro, J. Larrea Jiménez, Antonio Jefferson da Silva Machado, Walber H. Brito, Valentina Martelli","doi":"arxiv-2404.16194","DOIUrl":"https://doi.org/arxiv-2404.16194","url":null,"abstract":"The bismuth-halide Bi$_4$I$_4$ undergoes a structural transition around\u0000$T_Psim 300$K, which separates a high-temperature $beta$ phase ($T>T_P$) from\u0000a low-temperature $alpha$ phase ($T<T_P$). $alpha$ and $beta$ phases are\u0000suggested to host electronic band structures with distinct topological\u0000classifications. Rapid quenching was reported to stabilize a metastable\u0000$beta$-Bi$_4$I$_4$ at $T<T_P$, making possible a comparative study of the\u0000physical properties of the two phases in the same low-temperature range. In\u0000this work, we present a structural investigation of the Bi$_4$I$_4$ before and\u0000after quenching together with electrical resistivity measurements. We found\u0000that rapid cooling does not consistently lead to a metastable\u0000$beta$-Bi$_4$I$_4$, and a quick transition to $alpha$-Bi$_4$I$_4$ is\u0000observed. As a result, the comparison of putative signatures of different\u0000topologies attributed to a specific structural phase should be carefully\u0000considered. The observed phase instability is accompanied by an increase in\u0000iodine vacancies and by a change in the temperature dependence of electrical\u0000resistivity, pointing to native defects as a possible origin of our finding.\u0000Density functional theory (DFT) calculations support the scenario that iodine\u0000vacancies, together with bismuth antisites and interstitials, are among the\u0000defects that are more likely to occur in Bi$_4$I$_4$ during the growth.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"31 11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dongsung Choi, Masataka Mogi, Umberto De Giovannini, Doron Azoury, Baiqing Lv, Yifan Su, Hannes Hübener, Angel Rubio, Nuh Gedik
Floquet engineering is a novel method of manipulating quantum phases of matter via periodic driving [1, 2]. It has successfully been utilized in different platforms ranging from photonic systems [3] to optical lattice of ultracold atoms [4, 5]. In solids, light can be used as the periodic drive via coherent light-matter interaction. This leads to hybridization of Bloch electrons with photons resulting in replica bands known as Floquet-Bloch states. After the direct observation of Floquet-Bloch states in a topological insulator [6], their manifestations have been seen in a number of other experiments [7-14]. By engineering the electronic band structure using Floquet-Bloch states, various exotic phase transitions have been predicted [15-22] to occur. To realize these phases, it is necessary to better understand the nature of Floquet-Bloch states in different materials. However, direct energy and momentum resolved observation of these states is still limited to only few material systems [6, 10, 14, 23, 24]. Here, we report direct observation of Floquet-Bloch states in monolayer epitaxial graphene which was the first proposed material platform [15] for Floquet engineering. By using time- and angle-resolved photoemission spectroscopy (trARPES) with mid-infrared (mid-IR) pump excitation, we detected replicas of the Dirac cone. Pump polarization dependence of these replica bands unequivocally shows that they originate from the scattering between Floquet-Bloch states and photon-dressed free-electron-like photoemission final states, called Volkov states. Beyond graphene, our method can potentially be used to directly observe Floquet-Bloch states in other systems paving the way for Floquet engineering in a wide range of quantum materials.
{"title":"Direct observation of Floquet-Bloch states in monolayer graphene","authors":"Dongsung Choi, Masataka Mogi, Umberto De Giovannini, Doron Azoury, Baiqing Lv, Yifan Su, Hannes Hübener, Angel Rubio, Nuh Gedik","doi":"arxiv-2404.14392","DOIUrl":"https://doi.org/arxiv-2404.14392","url":null,"abstract":"Floquet engineering is a novel method of manipulating quantum phases of\u0000matter via periodic driving [1, 2]. It has successfully been utilized in\u0000different platforms ranging from photonic systems [3] to optical lattice of\u0000ultracold atoms [4, 5]. In solids, light can be used as the periodic drive via\u0000coherent light-matter interaction. This leads to hybridization of Bloch\u0000electrons with photons resulting in replica bands known as Floquet-Bloch\u0000states. After the direct observation of Floquet-Bloch states in a topological\u0000insulator [6], their manifestations have been seen in a number of other\u0000experiments [7-14]. By engineering the electronic band structure using\u0000Floquet-Bloch states, various exotic phase transitions have been predicted\u0000[15-22] to occur. To realize these phases, it is necessary to better understand\u0000the nature of Floquet-Bloch states in different materials. However, direct\u0000energy and momentum resolved observation of these states is still limited to\u0000only few material systems [6, 10, 14, 23, 24]. Here, we report direct\u0000observation of Floquet-Bloch states in monolayer epitaxial graphene which was\u0000the first proposed material platform [15] for Floquet engineering. By using\u0000time- and angle-resolved photoemission spectroscopy (trARPES) with mid-infrared\u0000(mid-IR) pump excitation, we detected replicas of the Dirac cone. Pump\u0000polarization dependence of these replica bands unequivocally shows that they\u0000originate from the scattering between Floquet-Bloch states and photon-dressed\u0000free-electron-like photoemission final states, called Volkov states. Beyond\u0000graphene, our method can potentially be used to directly observe Floquet-Bloch\u0000states in other systems paving the way for Floquet engineering in a wide range\u0000of quantum materials.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fano resonance arises from interference between a direct path and a resonant path. Predictions and observations of Fano profiles of conductance have been reported yet only in nonchiral electron transport. We propose an electronic Mach-Zehnder-Fano interferometer(textcolor{blue}{MZFI}) that integrates a quantum dot to an electronic Mach-Zehnder interferometer and investigate various transport spectra of this type of device. Electron motion in the device is chiral and backscattering is absent, enabling the transmission, linear conductance and differential spectra such as differential conductance, differential shot noise and differential Fano factor to possess perfect Fano profiles that can be fully tuned by an external magnetic flux. For a symmetric interferometer of(two arms with the same length, even the current and shot noise demonstrate fully tunable resonances and are bestowed different hallmarks unique to Fano resonances. All the transport spectra display the same evolution pattern in an evolution cycle, which along with the profiles are robust against variation of the parameters defining the device.
{"title":"Fully Tunable Fano Resonances in Chiral Electronic Transport","authors":"Ai-Ying Ye, Zhao Yang Zeng","doi":"arxiv-2404.13597","DOIUrl":"https://doi.org/arxiv-2404.13597","url":null,"abstract":"Fano resonance arises from interference between a direct path and a resonant\u0000path. Predictions and observations of Fano profiles of conductance have been\u0000reported yet only in nonchiral electron transport. We propose an electronic\u0000Mach-Zehnder-Fano interferometer(textcolor{blue}{MZFI}) that integrates a\u0000quantum dot to an electronic Mach-Zehnder interferometer and investigate\u0000various transport spectra of this type of device. Electron motion in the device\u0000is chiral and backscattering is absent, enabling the transmission, linear\u0000conductance and differential spectra such as differential conductance,\u0000differential shot noise and differential Fano factor to possess perfect Fano\u0000profiles that can be fully tuned by an external magnetic flux. For a symmetric\u0000interferometer of(two arms with the same length, even the current and shot\u0000noise demonstrate fully tunable resonances and are bestowed different hallmarks\u0000unique to Fano resonances. All the transport spectra display the same evolution\u0000pattern in an evolution cycle, which along with the profiles are robust against\u0000variation of the parameters defining the device.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"102 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jingtian Shi, Nicolás Morales-Durán, Eslam Khalaf, Allan H. MacDonald
Topological flat moir'e bands with nearly ideal quantum geometry have been identified in AA homobilayer transition metal dichalcogenide moir'e superlattices, and are thought to be crucial for understanding the fractional Chern insulating states recently observed therein. Previous work proposed viewing the system using an adiabatic approximation that replaces the position-dependence of the layer spinor by a nonuniform periodic effective magnetic field. When the local zero-point kinetic energy of this magnetic field cancels identically against that of an effective Zeeman energy, a Bloch-band version of Aharonov-Casher zero-energy modes, which we refer to as Aharonov-Casher band, emerges leading to ideal quantum geometry. Here, we critically examine the validity of the adiabatic approximation and identify the parameter regimes under which Aharonov-Casher bands emerge. We show that the adiabatic approximation is accurate for a wide range of parameters including those realized in experiments. Furthermore, we show that while the cancellation leading to the emergence of Aharonov-Casher bands is generally not possible beyond the leading Fourier harmonic, the leading harmonic is the dominant term in the Fourier expansions of the zero-point kinetic energy and Zeeman energy. As a result, the leading harmonic expansion accurately captures the trend of the bandwidth and quantum geometry, though it may fail to quantitatively reproduce more detailed information about the bands such as the Berry curvature distribution.
{"title":"Adiabatic Approximation and Aharonov-Casher Bands in Twisted Homobilayer TMDs","authors":"Jingtian Shi, Nicolás Morales-Durán, Eslam Khalaf, Allan H. MacDonald","doi":"arxiv-2404.13455","DOIUrl":"https://doi.org/arxiv-2404.13455","url":null,"abstract":"Topological flat moir'e bands with nearly ideal quantum geometry have been\u0000identified in AA homobilayer transition metal dichalcogenide moir'e\u0000superlattices, and are thought to be crucial for understanding the fractional\u0000Chern insulating states recently observed therein. Previous work proposed\u0000viewing the system using an adiabatic approximation that replaces the\u0000position-dependence of the layer spinor by a nonuniform periodic effective\u0000magnetic field. When the local zero-point kinetic energy of this magnetic field\u0000cancels identically against that of an effective Zeeman energy, a Bloch-band\u0000version of Aharonov-Casher zero-energy modes, which we refer to as\u0000Aharonov-Casher band, emerges leading to ideal quantum geometry. Here, we\u0000critically examine the validity of the adiabatic approximation and identify the\u0000parameter regimes under which Aharonov-Casher bands emerge. We show that the\u0000adiabatic approximation is accurate for a wide range of parameters including\u0000those realized in experiments. Furthermore, we show that while the cancellation\u0000leading to the emergence of Aharonov-Casher bands is generally not possible\u0000beyond the leading Fourier harmonic, the leading harmonic is the dominant term\u0000in the Fourier expansions of the zero-point kinetic energy and Zeeman energy.\u0000As a result, the leading harmonic expansion accurately captures the trend of\u0000the bandwidth and quantum geometry, though it may fail to quantitatively\u0000reproduce more detailed information about the bands such as the Berry curvature\u0000distribution.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Subhrangsu Saha, John E. Dolbow, Oscar Lopez-Pamies
With the fundamental objective of establishing the universality of the Griffith energy competition to describe the growth of large cracks in solids emph{not} just under monotonic but under general loading conditions, this paper puts forth a generalization of the classical Griffith energy competition in nominally elastic brittle materials to arbitrary emph{non-monotonic} quasistatic loading conditions, which include monotonic and cyclic loadings as special cases. Centered around experimental observations, the idea consists in: $i$) viewing the critical energy release rate $mathcal{G}_c$ emph{not} as a material constant but rather as a material function of both space $textbf{X}$ and time $t$, $ii$) one that decreases in value as the loading progresses, this solely within a small region $Omega_ell(t)$ around crack fronts, with the characteristic size $ell$ of such a region being material specific, and $iii$) with the decrease in value of $mathcal{G}_c$ being dependent on the history of the elastic fields in $Omega_ell(t)$. By construction, the proposed Griffith formulation is able to describe any Paris-law behavior of the growth of large cracks in nominally elastic brittle materials for the limiting case when the loading is cyclic. For the opposite limiting case when the loading is monotonic, the formulation reduces to the classical Griffith formulation. Additional properties of the proposed formulation are illustrated via a parametric analysis and direct comparisons with representative fatigue fracture experiments on a ceramic, mortar, and PMMA.
{"title":"A Griffith description of fracture for non-monotonic loading with application to fatigue","authors":"Subhrangsu Saha, John E. Dolbow, Oscar Lopez-Pamies","doi":"arxiv-2404.13466","DOIUrl":"https://doi.org/arxiv-2404.13466","url":null,"abstract":"With the fundamental objective of establishing the universality of the\u0000Griffith energy competition to describe the growth of large cracks in solids\u0000emph{not} just under monotonic but under general loading conditions, this\u0000paper puts forth a generalization of the classical Griffith energy competition\u0000in nominally elastic brittle materials to arbitrary emph{non-monotonic}\u0000quasistatic loading conditions, which include monotonic and cyclic loadings as\u0000special cases. Centered around experimental observations, the idea consists in:\u0000$i$) viewing the critical energy release rate $mathcal{G}_c$ emph{not} as a\u0000material constant but rather as a material function of both space $textbf{X}$\u0000and time $t$, $ii$) one that decreases in value as the loading progresses, this\u0000solely within a small region $Omega_ell(t)$ around crack fronts, with the\u0000characteristic size $ell$ of such a region being material specific, and $iii$)\u0000with the decrease in value of $mathcal{G}_c$ being dependent on the history of\u0000the elastic fields in $Omega_ell(t)$. By construction, the proposed Griffith\u0000formulation is able to describe any Paris-law behavior of the growth of large\u0000cracks in nominally elastic brittle materials for the limiting case when the\u0000loading is cyclic. For the opposite limiting case when the loading is\u0000monotonic, the formulation reduces to the classical Griffith formulation.\u0000Additional properties of the proposed formulation are illustrated via a\u0000parametric analysis and direct comparisons with representative fatigue fracture\u0000experiments on a ceramic, mortar, and PMMA.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140803392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the last few decades, interference has been extensively studied in both the quantum and classical fields, which reveals light volatility and is widely used for high-precision measurements. We have put forward the phenomenon in which the discrete diffraction and interference phenomena, presented by the time-varying voltage of a Su-Schrieffer-Heeger (SSH) circuit model with an anti-PT symmetry (APT) symmetry. To demonstrate Young's double-slit phenomenon in an APT circuit, we initially explore the coupled mode theory (CMT) of voltage in the broken phase, observe discrete diffraction under single excitation and interference under double excitations. Furthermore, we design a phase-shifting circuit to observe the effects of phase difference and distance on discrete interference. Our work combines the effects in optics with condensed matter physics, show the Young's double-slit phenomenon in electrical circuits theoretically and experimentally.
{"title":"Observation of Young's double-slit phenomenon in anti-PT-symmetric electrical circuits","authors":"Xiumei Wang, Keyu Pan, Xizhou Shen, Xingping Zhou","doi":"arxiv-2404.11084","DOIUrl":"https://doi.org/arxiv-2404.11084","url":null,"abstract":"In the last few decades, interference has been extensively studied in both\u0000the quantum and classical fields, which reveals light volatility and is widely\u0000used for high-precision measurements. We have put forward the phenomenon in\u0000which the discrete diffraction and interference phenomena, presented by the\u0000time-varying voltage of a Su-Schrieffer-Heeger (SSH) circuit model with an\u0000anti-PT symmetry (APT) symmetry. To demonstrate Young's double-slit phenomenon\u0000in an APT circuit, we initially explore the coupled mode theory (CMT) of\u0000voltage in the broken phase, observe discrete diffraction under single\u0000excitation and interference under double excitations. Furthermore, we design a\u0000phase-shifting circuit to observe the effects of phase difference and distance\u0000on discrete interference. Our work combines the effects in optics with\u0000condensed matter physics, show the Young's double-slit phenomenon in electrical\u0000circuits theoretically and experimentally.","PeriodicalId":501211,"journal":{"name":"arXiv - PHYS - Other Condensed Matter","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140615166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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