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Scaling behaviour under the influence of a homogeneous size-dependent perturbation 均匀尺寸相关扰动影响下的标度行为
IF 0.6 4区 物理与天体物理
Condensed Matter Physics Pub Date : 2023-03-03 DOI: 10.5488/CMP.26.13101
L. Turban
{"title":"Scaling behaviour under the influence of a homogeneous size-dependent perturbation","authors":"L. Turban","doi":"10.5488/CMP.26.13101","DOIUrl":"https://doi.org/10.5488/CMP.26.13101","url":null,"abstract":"We study the finite-size scaling behaviour at the critical point, resulting from the addition of a homogeneous size-dependent perturbation, decaying as an inverse power of the system size. The scaling theory is first formulated in a general framework and then illustrated using three concrete problems for which exact results are obtained.","PeriodicalId":10528,"journal":{"name":"Condensed Matter Physics","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81986998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Temperature scaling analysis of the 3D disordered Ising model with power-law correlated defects 具有幂律相关缺陷的三维无序Ising模型的温度标度分析
IF 0.6 4区 物理与天体物理
Condensed Matter Physics Pub Date : 2023-03-03 DOI: 10.5488/CMP.26.13201
S. Kazmin, W. Janke
{"title":"Temperature scaling analysis of the 3D disordered Ising model with power-law correlated defects","authors":"S. Kazmin, W. Janke","doi":"10.5488/CMP.26.13201","DOIUrl":"https://doi.org/10.5488/CMP.26.13201","url":null,"abstract":"We consider the three-dimensional site-diluted Ising model with power-law correlated defects and study the critical behavior of the second-moment correlation length and the magnetic susceptibility in the high-temperature phase. By comparing, for various defect correlation strengths, the extracted critical exponents ν and γ with the results of our previous finite-size scaling study, we consolidate the exponent estimates.","PeriodicalId":10528,"journal":{"name":"Condensed Matter Physics","volume":"31 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91318666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Some speculations about local thermalization of nonequilibrium extended quantum systems 关于非平衡扩展量子系统局部热化的一些推测
IF 0.6 4区 物理与天体物理
Condensed Matter Physics Pub Date : 2023-03-03 DOI: 10.5488/CMP.26.13502
Máximo Coppola, D. Karevski
{"title":"Some speculations about local thermalization of nonequilibrium extended quantum systems","authors":"Máximo Coppola, D. Karevski","doi":"10.5488/CMP.26.13502","DOIUrl":"https://doi.org/10.5488/CMP.26.13502","url":null,"abstract":"We discuss the possibility of defining an emergent local temperature in extended quantum many-body systems evolving out of equilibrium. For the most simple case of free-fermionic systems, we give an explicit formula for the effective temperature in the case of, not necessarily unitary, Gaussian preserving dynamics. In this framework, we consider the hopping fermions on a one-dimensional lattice submitted to randomly distributed projective measurements of the local occupation numbers. We show from the average over many quantum trajectories that the effective temperature relaxes exponentially towards infinity.","PeriodicalId":10528,"journal":{"name":"Condensed Matter Physics","volume":"10 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81910973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 1
Impact of the p-cubic Dresselhaus term on the spin Hall effect p立方Dresselhaus项对自旋霍尔效应的影响
IF 0.6 4区 物理与天体物理
Condensed Matter Physics Pub Date : 2023-03-03 DOI: 10.5488/CMP.26.13504
E. Santana-Suárez, F. Mireles
{"title":"Impact of the p-cubic Dresselhaus term on the spin Hall effect","authors":"E. Santana-Suárez, F. Mireles","doi":"10.5488/CMP.26.13504","DOIUrl":"https://doi.org/10.5488/CMP.26.13504","url":null,"abstract":"It is well known that the Dresselhaus spin-orbit coupling (SOC) in semiconductor two dimensional electron gases (2DEGs) possesses both linear and cubic in momentum contributions. Nevertheless, the latter is usually neglected in most theoretical studies. However, recent Kerr rotation experiments have revealed a significant enhancement of the cubic Dresselhaus interaction by increasing the drift velocities in 2DEGs hosted in GaAs quantum wells. Here, we present a study of the optical spin Hall conductivity in 2DEGs under the simultaneous presence of Rashba and (linear plus cubic) Dresselhaus SOC. The work was done within the Kubo formalism in linear response. We show that the coexistence of the Rashba and cubic Dresselhaus SOC in 2DEGs promotes a strong anisotropy of the band spin splitting which in turn leads to a very characteristic frequency dependence of the spin Hall conductivity. We find that the spin Hall conductivity response could be very sensible to sizeable cubic-Dresselhaus coupling strength. This may be of relevance for the optical control of spin currents in 2DEGs with non-negligible cubic-Dresselhaus SOC.","PeriodicalId":10528,"journal":{"name":"Condensed Matter Physics","volume":"10 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83462040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Interplay of Kekulé distortions and laser fields in graphene 石墨烯中kekul<s:1>畸变与激光场的相互作用
IF 0.6 4区 物理与天体物理
Condensed Matter Physics Pub Date : 2023-03-03 DOI: 10.5488/CMP.26.13505
A. López, F. Mireles
{"title":"Interplay of Kekulé distortions and laser fields in graphene","authors":"A. López, F. Mireles","doi":"10.5488/CMP.26.13505","DOIUrl":"https://doi.org/10.5488/CMP.26.13505","url":null,"abstract":"We study the interplay between a Kekulé patterned distortion in monolayer graphene and a monochromatic laser irradiation, focusing in the long wavelength approximation of its Landau level structure. Exploiting the symmetries of the system, we calculate in the static regime an exact analytical solution for the energy spectrum and its eigenstates, which in turn allows us to find close expressions for the polarizations in the valley and pseudospin degrees of freedom. We find that due to the valley-momentum coupling, the valley polarization exhibits a distinct magnetic response for the two K-valley components. Owing to that, the introduction of the radiation field mixes the Landau levels, and it is shown that by tuning the system to resonance leads to a larger valley-polarization response as compared to the non-resonant scenario.","PeriodicalId":10528,"journal":{"name":"Condensed Matter Physics","volume":"73 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87036445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
An Abelian Higgs model for disclinations in nematics 向列数学中偏差的阿贝尔希格斯模型
IF 0.6 4区 物理与天体物理
Condensed Matter Physics Pub Date : 2023-03-03 DOI: 10.5488/CMP.26.13506
A. de Pádua Santos, F. Moraes, F. Santos, S. Fumeron
{"title":"An Abelian Higgs model for disclinations in nematics","authors":"A. de Pádua Santos, F. Moraes, F. Santos, S. Fumeron","doi":"10.5488/CMP.26.13506","DOIUrl":"https://doi.org/10.5488/CMP.26.13506","url":null,"abstract":"Topological defects in elastic media may be described by a geometric field akin to three-dimensional gravity. From this point of view, disclinations are line defects of zero width corresponding to a singularity of the curvature in an otherwise flat background. On the other hand, in two dimensions, the Frank free energy of a nematic liquid crystal may be interpreted as an Abelian Higgs Lagrangian. In this work, we construct an Abelian Higgs model coupled to ``gravity'' for the nematic phase, with the perspective of finding more realistic disclinations. That is, a cylindrically symmetric line defect of finite radius, invariant under translations along its axis. Numerical analysis of the equations of motion indeed yield a +1 winding number ``thick'' disclination. The defect is described jointly by the gauge and the Higgs fields, that compose the director field, and the background geometry. Away from the defect, the geometry is conical, associated to a dihedral deficit angle. The gauge field, confined to the defect, gives a structure to the disclination while the Higgs field, outside, represents the nematic order.","PeriodicalId":10528,"journal":{"name":"Condensed Matter Physics","volume":"29 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88852232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Slow and fast relaxation times of quantum lattice model with local multi-well potentials: phenomenological dynamics for Sn2P2S6 ferroelectric crystals 局域多阱势量子晶格模型的慢速和快速弛豫时间:Sn2P2S6铁电晶体的现象学动力学
IF 0.6 4区 物理与天体物理
Condensed Matter Physics Pub Date : 2023-01-04 DOI: 10.5488/CMP.25.43707
R. Erdem, S. Özüm, N. Güçlü
{"title":"Slow and fast relaxation times of quantum lattice model with local multi-well potentials: phenomenological dynamics for Sn2P2S6 ferroelectric crystals","authors":"R. Erdem, S. Özüm, N. Güçlü","doi":"10.5488/CMP.25.43707","DOIUrl":"https://doi.org/10.5488/CMP.25.43707","url":null,"abstract":"As a continuation of the previously published work [Velychko O. V., Stasyuk I. V., Phase Transitions, 2019, 92, 420], a phenomenological framework for the relaxation dynamics of quantum lattice model with multi-well potentials is given in the case of deformed Sn2P2S6 ferroelectric lattice. The framework is based on the combination of statistical equilibrium theory and irreversible thermodynamics. In order to study these dynamics in a connected way we assume that the dipole ordering or polarization (η) and volume deformation (u) can be treated as fluxes and forces in the sense of Onsager theory. From the linear relations between the forces and fluxes, the rate equations are derived and characterized by two relaxation times (τS , τF) which describe the irreversible process near the equilibrium states. The behaviors of τS and τF in the vicinity of ferroelectric phase transitions are studied.","PeriodicalId":10528,"journal":{"name":"Condensed Matter Physics","volume":"4 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88810682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Shell-model and first-principles calculations of vibrational, structural and ferroelectric properties of KH2PO4 KH2PO4的振动、结构和铁电性质的壳层模型和第一性原理计算
IF 0.6 4区 物理与天体物理
Condensed Matter Physics Pub Date : 2023-01-04 DOI: 10.5488/CMP.25.43709
R. Menchón, F. Torresi, J. Lasave, S. Koval
{"title":"Shell-model and first-principles calculations of vibrational, structural and ferroelectric properties of KH2PO4","authors":"R. Menchón, F. Torresi, J. Lasave, S. Koval","doi":"10.5488/CMP.25.43709","DOIUrl":"https://doi.org/10.5488/CMP.25.43709","url":null,"abstract":"We develop a shell model (SM) for potassium dihydrogen phosphate (KDP) which is fitted to ab initio (AI) results that include nonlocal van der Waals corrections. The SM is comprehensively tested by comparing results of structural, vibrational and ferroelectric properties with AI and experimental data. The relaxed structural parameters are in very good agreement with the AI results and the available experimental data. The Γ-point phonons and the total phonon densities of states (DOSs) in the ferroelectric and paraelectric phases calculated with the developed SM are in good overall agreement with the corresponding AI and experimental data. We also compute the effective Debye temperature as a function of T which shows good accordance with the corresponding AI and experimental results. Classical molecular dynamics (MD) simulations obtained with the developed SM show a FE-PE phase transition at ≈ 360 K in remarkable agreement with ab initio MD calculations.","PeriodicalId":10528,"journal":{"name":"Condensed Matter Physics","volume":"199 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75909524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Path integral Monte Carlo simulations of the geometrical effects in KDP crystals KDP晶体几何效应的路径积分蒙特卡罗模拟
IF 0.6 4区 物理与天体物理
Condensed Matter Physics Pub Date : 2023-01-04 DOI: 10.5488/CMP.25.43708
F. Torresi, J. Lasave, S. Koval
{"title":"Path integral Monte Carlo simulations of the geometrical effects in KDP crystals","authors":"F. Torresi, J. Lasave, S. Koval","doi":"10.5488/CMP.25.43708","DOIUrl":"https://doi.org/10.5488/CMP.25.43708","url":null,"abstract":"Path integral Monte Carlo (PIMC) simulations with very simple models were used in order to unveil the physics behind the isotope effects in H-bonded ferroelectrics. First, we studied geometrical effects in the H-bonds caused by deuteration with a general three-site model based on a back-to-back double Morse potential plus a Morse potential between oxygens, fitted to explain different general features for a wide set of H-bonded compounds. Our model results show the Ubbelohde or geometrical effect (GE), i.e., the expansion of the H-bond with deuteration, in agreement to what is observed in H-bonded ferroelectrics with short H-bonds. Moreover, adjusting the potential parameters to ab initio results, we have developed a 1D model which considers the bilinear proton-proton interaction in mean-field to study nuclear quantum effects that give rise to the GE in KDP crystals. PIMC simulations reveal that protons tunnel more efficiently than deuterons along the 1D chain, giving rise to a strong attraction center that pulls the oxygens together. This mechanism, which is based on the correlation between tunneling and geometrial modifications of the H-bonds, leads to a strong GE in the ordered phase of the chain at low temperature which is in good agreement with the experimental data.","PeriodicalId":10528,"journal":{"name":"Condensed Matter Physics","volume":"11 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88681858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 0
Temperature dependence of dielectric permittivity in incommensurately modulated phase of ammonium fluoroberyllate 氟酰基酸铵非共调相介电常数的温度依赖性
IF 0.6 4区 物理与天体物理
Condensed Matter Physics Pub Date : 2023-01-04 DOI: 10.5488/CMP.25.43704
B. Horon, O. Kushnir, P. Shchepanskyi, V. Stadnyk
{"title":"Temperature dependence of dielectric permittivity in incommensurately modulated phase of ammonium fluoroberyllate","authors":"B. Horon, O. Kushnir, P. Shchepanskyi, V. Stadnyk","doi":"10.5488/CMP.25.43704","DOIUrl":"https://doi.org/10.5488/CMP.25.43704","url":null,"abstract":"We study the temperature dependence of dielectric permittivity along the polar axis for ferroelectric ammonium fluoroberyllate (AFB) crystal in the vicinity of its phase transition points. The experimental data within incommensurately modulated phase of AFB is compared with the predictions of phenomenological models known from the literature: the Curie-Weiss (CW) law, the generalized Curie-Weiss (GCW) law, and the models by Levanyuk and Sannikov (LS) and by Prelovšek, Levstik and Filipič (PLF) suggested for improper ferroelectrics. It is shown that the LS approach describes the temperature behavior of the dielectric permittivity for the AFB crystal better than the CW, GWC and PLF models. The main physical reasons of this situation are elucidated.","PeriodicalId":10528,"journal":{"name":"Condensed Matter Physics","volume":"31 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91276378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
引用次数: 2
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