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Structural and phonon anomalies in the superconducting with varying doping level at high pressures 高压下不同掺杂水平超导体的结构和声子反常现象
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-06-20 DOI: 10.1209/0295-5075/ad44d3
Jie Xin, Jian-Bo Zhang, Gen-Da Gu, Alexander G. Gavriliuk, Igor Lyubutin, Viktor V. Struzhkin and Xiao-Jia Chen
{"title":"Structural and phonon anomalies in the superconducting with varying doping level at high pressures","authors":"Jie Xin, Jian-Bo Zhang, Gen-Da Gu, Alexander G. Gavriliuk, Igor Lyubutin, Viktor V. Struzhkin and Xiao-Jia Chen","doi":"10.1209/0295-5075/ad44d3","DOIUrl":"https://doi.org/10.1209/0295-5075/ad44d3","url":null,"abstract":"We examined the effect of the lattice compression on the crystal structure of the Bi2Sr2CaCu2 superconductor with nearly optimally doped and overdoped composition using X-ray diffraction technique. Our studies show that at high pressures (up to 30 GPa ) the doping level does not affect the crystal structure of this superconductor. Along with this, structural anomalies in ratio appear at a pressure that corresponds to that at which Tc begins to decrease. This fact indicates a close connection between the observed anomalies and superconductivity. We also studied the effect of doping and pressure on the Tc(P) and on the Raman active lattice modes of the Bi2Sr2CaCu2 superconductors. We find universal suppression of the Tc by the pressure starting from the critical pressure Pc in the range from 9 to 16 GPa, depending on the doping level of the Bi2Sr2CaCu2 samples. Concomitantly, we observe phonon anomalies around 10 to 20 GPa, which indicate possible pressure-induced charge redistribution in BiO layers. These newly detected anomalies may be related to the changes in the electronic structure which compete with the superconductivity.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"37 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141501653","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
Gravitating kinks with asymptotically flat metrics 具有渐近平坦度量的引力扭结
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-06-20 DOI: 10.1209/0295-5075/ad49d0
Ziqi Wang, Yuan Zhong and Hui Wang
{"title":"Gravitating kinks with asymptotically flat metrics","authors":"Ziqi Wang, Yuan Zhong and Hui Wang","doi":"10.1209/0295-5075/ad49d0","DOIUrl":"https://doi.org/10.1209/0295-5075/ad49d0","url":null,"abstract":"In this work, we consider a two-dimensional (2D) dilaton gravity model where the dilaton kinetic term is modified by an additional derivative coupling term . In the case with a canonical scalar matter field, the field equations of this model have a simple first-order formalism, from which exact static kink solutions can be constructed. The novelty of these solutions is that the corresponding metric can be asymptotically flat rather than asymptotically anti-de Sitter. The linear stability and the localization of scalar matter fields are also studied. It was found that the solutions are stable against small linear perturbations, and the localization of scalar matter fields can be realized by introducing scalar-kink interactions.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141528886","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 synchronization and cortical input in models of brain networks 大脑网络模型中同步与皮层输入的相互作用
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-06-06 DOI: 10.1209/0295-5075/ad438e
Jakub Sawicki and Eckehard Schöll
{"title":"Interplay of synchronization and cortical input in models of brain networks","authors":"Jakub Sawicki and Eckehard Schöll","doi":"10.1209/0295-5075/ad438e","DOIUrl":"https://doi.org/10.1209/0295-5075/ad438e","url":null,"abstract":"It is well known that synchronization patterns and coherence have a major role in the functioning of brain networks, both in pathological and in healthy states. In particular, in the perception of sound, one can observe an increase in coherence between the global dynamics in the network and the auditory input. In this perspective article, we show that synchronization scenarios are determined by a fine interplay between network topology, the location of the input, and frequencies of these cortical input signals. To this end, we analyze the influence of an external stimulation in a network of FitzHugh-Nagumo oscillators with empirically measured structural connectivity, and discuss different areas of cortical stimulation, including the auditory cortex.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"48 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551095","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
Complex phases in quantum mechanics 量子力学中的复杂相
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-06-06 DOI: 10.1209/0295-5075/ad5103
Carl M. Bender and Daniel W. Hook
{"title":"Complex phases in quantum mechanics","authors":"Carl M. Bender and Daniel W. Hook","doi":"10.1209/0295-5075/ad5103","DOIUrl":"https://doi.org/10.1209/0295-5075/ad5103","url":null,"abstract":"Schrödinger's equation is a local differential equation and boundary conditions are required to determine the solution uniquely. Depending on the choice of boundary conditions, a given Hamiltonian may describe several different physically observable phases, each exhibiting its own characteristic global symmetry.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"46 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551096","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
Information scrambling —A quantum thermodynamic perspective 信息扰乱--量子热力学视角
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-06-03 DOI: 10.1209/0295-5075/ad4413
Akram Touil and Sebastian Deffner
{"title":"Information scrambling —A quantum thermodynamic perspective","authors":"Akram Touil and Sebastian Deffner","doi":"10.1209/0295-5075/ad4413","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4413","url":null,"abstract":"Recent advances in quantum information science have shed light on the intricate dynamics of quantum many-body systems, for which quantum information scrambling is a perfect example. Motivated by considerations of the thermodynamics of quantum information, this perspective aims at synthesizing key findings from several pivotal studies and exploring various aspects of quantum scrambling. We consider quantifiers such as the out-of-time-ordered correlator (OTOC) and the quantum mutual information, their connections to thermodynamics, and their role in understanding chaotic vs. integrable quantum systems. With a focus on representative examples, we cover a range of topics, including the thermodynamics of quantum information scrambling, and the scrambling dynamics in quantum gravity models such as the Sachdev-Ye-Kitaev (SYK) model. Examining these diverse approaches enables us to highlight the multifaceted nature of quantum information scrambling and its significance in understanding the fundamental aspects of quantum many-body dynamics at the intersection of quantum mechanics and thermodynamics.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"51 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256031","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
Constructing predictive models for seismic oscillation parameters using covariance functions and Doppler effect phenomena: A case study of InSight mission V2 data 利用协方差函数和多普勒效应现象构建地震振荡参数预测模型：InSight 任务 V2 数据案例研究
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-06-03 DOI: 10.1209/0295-5075/ad4412
Jonas Skeivalas, Eimuntas Paršeliūnas, Dominykas Šlikas, Romuald Obuchovski and Raimundas Putrimas
{"title":"Constructing predictive models for seismic oscillation parameters using covariance functions and Doppler effect phenomena: A case study of InSight mission V2 data","authors":"Jonas Skeivalas, Eimuntas Paršeliūnas, Dominykas Šlikas, Romuald Obuchovski and Raimundas Putrimas","doi":"10.1209/0295-5075/ad4412","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4412","url":null,"abstract":"An ability to construct predictive models for identifying seismic oscillation parameters by using the mathematics of covariance functions and Doppler effect phenomena is examined in this work. In the calculations, the Mars seismic oscillations measurement data from InSight Mission V2, observed in the months May, June and July of 2019, was used. To analyze the observation data arrays the Doppler phenomena and the expressions of covariance functions were employed. The seismic oscillations trend's intensity vectors were assessed by least squares method, and the random errors of measurements at the stations were eliminated partially as well. The estimates of the vector's auto-covariance and cross-covariance functions were derived by altering the quantization interval on the general time scale while varying the magnitude of the seismic oscillation vector on the same time scale. To detect the mean values of z —the main parameter of Doppler expression— we developed a formula by involving the derivatives of cross-covariance functions of a single vector and algebraic sum of the relevant vectors.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"25 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256092","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
Ultracold atomic spin mixtures in ultrastable magnetic field environments 超稳定磁场环境中的超冷原子自旋混合物
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-06-02 DOI: 10.1209/0295-5075/ad4b9a
Riccardo Cominotti, Chiara Rogora, Alessandro Zenesini, Giacomo Lamporesi and Gabriele Ferrari
{"title":"Ultracold atomic spin mixtures in ultrastable magnetic field environments","authors":"Riccardo Cominotti, Chiara Rogora, Alessandro Zenesini, Giacomo Lamporesi and Gabriele Ferrari","doi":"10.1209/0295-5075/ad4b9a","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4b9a","url":null,"abstract":"Ultracold atomic spin mixtures develop rich and intriguing magnetic properties when external radiation coherently couples different spin states. In particular, the coupled mixture may acquire a critical behavior when the spin interactions equal the coupling energy. However, atomic mixtures generally feature a relatively high sensitivity to magnetic fields that can set a limitation to the observable phenomena. In this article, we present an overview of experimental studies of magnetism based on superfluid multicomponent gases in an ultrastable magnetic field environment, which recently became available.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"44 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256326","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
Universality of kappa distributions 卡帕分布的普遍性
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-06-02 DOI: 10.1209/0295-5075/ad4415
George Livadiotis and David J. McComas
{"title":"Universality of kappa distributions","authors":"George Livadiotis and David J. McComas","doi":"10.1209/0295-5075/ad4415","DOIUrl":"https://doi.org/10.1209/0295-5075/ad4415","url":null,"abstract":"This paper reveals the universality of the particle energy distribution function, despite the arbitrariness that characterizes the generalized thermodynamic entropic function. We show that the canonical distribution, that is, the distribution function that maximizes this entropy under the constraints of canonical ensemble, is always the same and given by the kappa distribution function. We use the recently developed entropy defect to express the generalized entropic formulation. The entropy defect is a thermodynamic concept that describes the loss of entropy due to the order induced by the presence of correlations. Then we carry out functional analysis to maximize the implicit expression of the generalized entropy. Critically, we show that the Lagrange multipliers have the same exact arbitrariness as the generalized entropic function, allowing us to cancel it out and proving the universality of canonical distribution as the kappa distribution function.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"310 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256088","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
Reimagining and reinterpreting Cooper pairs, the Fermi sea, Pauli blocking and superfluidity: The Pauli principle in collective motion 重新认识和解释库珀对、费米海、泡利封锁和超流：集体运动中的泡利原理
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-06-02 DOI: 10.1209/0295-5075/ad44d2
D. K. Watson
{"title":"Reimagining and reinterpreting Cooper pairs, the Fermi sea, Pauli blocking and superfluidity: The Pauli principle in collective motion","authors":"D. K. Watson","doi":"10.1209/0295-5075/ad44d2","DOIUrl":"https://doi.org/10.1209/0295-5075/ad44d2","url":null,"abstract":"Identifying possible microscopic mechanisms underlying superfluidity has been the goal of various studies since the introduction of the original BCS theory. Recently a series of papers have proposed microscopic dynamics based on normal modes to describe superfluidity without the use of real-space Cooper pairs. Multiple properties were determined with excellent agreement with experimental data. The group theoretic basis of this general N-body approach has allowed the microscopic behavior underlying these results to be analyzed in detail. This reimagination is now used to reinterpret several interrelated phenomena including Cooper pairs, the Fermi sea, and Pauli blocking. This approach adheres closely to the early tenets of superconductivity/superfluidity which assumed pairing only in momentum space, not in real space. The Pauli principle is used, in its recently revealed role in collective motion, to select the allowed normal modes. The expected properties of superfluidity including the rigidity of the wave function, interactions between the fermions in different pairs, convergence of the momentum and the gap in the excitation spectrum are discussed.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"25 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256028","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
Towards synthetic magnetic turbulence with coherent structures 实现具有相干结构的合成磁湍流
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-05-30 DOI: 10.1209/0295-5075/ad438f
Jeremiah Lübke, Frederic Effenberger, Mike Wilbert, Horst Fichtner and Rainer Grauer
{"title":"Towards synthetic magnetic turbulence with coherent structures","authors":"Jeremiah Lübke, Frederic Effenberger, Mike Wilbert, Horst Fichtner and Rainer Grauer","doi":"10.1209/0295-5075/ad438f","DOIUrl":"https://doi.org/10.1209/0295-5075/ad438f","url":null,"abstract":"Synthetic turbulence is a relevant tool to study complex astrophysical and space plasma environments inaccessible by direct simulation. However, conventional models lack intermittent coherent structures, which are essential in realistic turbulence. We present a novel method featuring coherent structures, conditional structure function scaling and fieldline curvature statistics comparable to magnetohydrodynamic turbulence. Enhanced transport of charged particles is investigated as well. This method presents significant progress towards physically faithful synthetic turbulence.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"32 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256089","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
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