Pub Date : 2024-11-29DOI: 10.1016/j.physleta.2024.130100
Riku Yoshimoto, Yasusada Nambu
The relationship between gravitational anomalies and Hawking radiation of black holes was revealed by Wilczek and Robinson. In this study, we apply their method to an analogue de Sitter spacetime in the quantum Hall system with an expanding edge. The chiral nature of the system eliminates the need for imposing the condition of ingoing modes near the horizon. Moreover, this system is structured so that the de Sitter space is sandwiched between two flat spaces, and although the effects of the anomaly would not appear in an ordinal de Sitter spacetime, they manifest themselves as boundary conditions between the de Sitter and the flat regions. By performing calculations under these boundary conditions, we obtain the flux of Hawking radiation in the outer flat region with the Gibbons-Hawking temperature of the de Sitter horizon.
{"title":"Hawking radiation in quantum Hall system with an expanding edge: Application of anomaly method","authors":"Riku Yoshimoto, Yasusada Nambu","doi":"10.1016/j.physleta.2024.130100","DOIUrl":"10.1016/j.physleta.2024.130100","url":null,"abstract":"<div><div>The relationship between gravitational anomalies and Hawking radiation of black holes was revealed by Wilczek and Robinson. In this study, we apply their method to an analogue de Sitter spacetime in the quantum Hall system with an expanding edge. The chiral nature of the system eliminates the need for imposing the condition of ingoing modes near the horizon. Moreover, this system is structured so that the de Sitter space is sandwiched between two flat spaces, and although the effects of the anomaly would not appear in an ordinal de Sitter spacetime, they manifest themselves as boundary conditions between the de Sitter and the flat regions. By performing calculations under these boundary conditions, we obtain the flux of Hawking radiation in the outer flat region with the Gibbons-Hawking temperature of the de Sitter horizon.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130100"},"PeriodicalIF":2.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-11-28DOI: 10.1016/j.physleta.2024.130106
Hai-Bo Xing , Jia-Xin Li , Jun-Long Zhao
In this paper, we introduce a logarithmic coherence measure that is associated with function f, based on the standard convex roof construction. We define the logarithmic coherence for pure states using the logarithmic function and extend this definition to mixed states, terming it the logarithmic coherence measure related to function f. We show that the logarithmic coherence measure related to function f is a proper coherence measure, fulfilling the four conditions that a coherence measure should satisfy. Moreover, we also investigate some interesting properties of the logarithmic coherence measure related to function f, including the subadditivity, superadditivity and the existence of its regularized version. We find that the logarithmic coherence measure related to function f can be either subadditive or superadditive, depending on certain conditions. Finally, we discuss the relationships among different logarithmic coherence measures, as well as their connections with other coherence measures.
{"title":"Logarithmic coherence measure related to function f based on the standard convex roof construction","authors":"Hai-Bo Xing , Jia-Xin Li , Jun-Long Zhao","doi":"10.1016/j.physleta.2024.130106","DOIUrl":"10.1016/j.physleta.2024.130106","url":null,"abstract":"<div><div>In this paper, we introduce a logarithmic coherence measure that is associated with function <em>f</em>, based on the standard convex roof construction. We define the logarithmic coherence for pure states using the logarithmic function and extend this definition to mixed states, terming it the logarithmic coherence measure related to function <em>f</em>. We show that the logarithmic coherence measure related to function <em>f</em> is a proper coherence measure, fulfilling the four conditions that a coherence measure should satisfy. Moreover, we also investigate some interesting properties of the logarithmic coherence measure related to function <em>f</em>, including the subadditivity, superadditivity and the existence of its regularized version. We find that the logarithmic coherence measure related to function <em>f</em> can be either subadditive or superadditive, depending on certain conditions. Finally, we discuss the relationships among different logarithmic coherence measures, as well as their connections with other coherence measures.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"530 ","pages":"Article 130106"},"PeriodicalIF":2.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-11-28DOI: 10.1016/j.physleta.2024.130108
Wajdi A. Gaddah
This paper investigates the relativistic Dirac analogue of a one-dimensional Schrödinger oscillator in a symmetric sextic anharmonic double-well potential, constructed via a non-minimal substitution technique. We show that the large component of the Dirac spinor obeys a Schrödinger-like equation, whose eigenvalues are used to determine the relativistic energy levels. These eigenvalues are computed using high-order Bender-Wu perturbation theory, resulting in an algebraic recursion relation for the expansion coefficients. A proper analytic formula describing the large-order behavior of these coefficients is derived, revealing their asymptotic factorial divergence. Additionally, a conjecture illustrating the dependence of these coefficients on the energy quantum numbers is proposed and confirmed. To overcome the challenge posed by the divergent nature of the perturbative eigenvalue expansion, Borel resummation with conformal mapping and Padé approximation are employed, leading to accurate results of the relativistic energy levels and their non-relativistic counterparts as functions of the coupling constants.
{"title":"Dirac oscillator in a symmetric sextic anharmonic double-well potential","authors":"Wajdi A. Gaddah","doi":"10.1016/j.physleta.2024.130108","DOIUrl":"10.1016/j.physleta.2024.130108","url":null,"abstract":"<div><div>This paper investigates the relativistic Dirac analogue of a one-dimensional Schrödinger oscillator in a symmetric sextic anharmonic double-well potential, constructed via a non-minimal substitution technique. We show that the large component of the Dirac spinor obeys a Schrödinger-like equation, whose eigenvalues are used to determine the relativistic energy levels. These eigenvalues are computed using high-order Bender-Wu perturbation theory, resulting in an algebraic recursion relation for the expansion coefficients. A proper analytic formula describing the large-order behavior of these coefficients is derived, revealing their asymptotic factorial divergence. Additionally, a conjecture illustrating the dependence of these coefficients on the energy quantum numbers is proposed and confirmed. To overcome the challenge posed by the divergent nature of the perturbative eigenvalue expansion, Borel resummation with conformal mapping and Padé approximation are employed, leading to accurate results of the relativistic energy levels and their non-relativistic counterparts as functions of the coupling constants.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"530 ","pages":"Article 130108"},"PeriodicalIF":2.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-11-28DOI: 10.1016/j.physleta.2024.130109
Tian-Xue Ma , Xiao-Lei Tang , Dong Li , Yue-Sheng Wang
Topologically protected states in phononic crystals provide a new avenue to design robust acoustic devices as they are immune to structural imperfections or defects. In this work, the topological characteristics of solid/liquid phononic waveguides are investigated numerically using the finite element approach. Both the topologically trivial and non-trivial phononic crystals can be obtained by varying their geometry and hence are used for the construction of the phononic crystal structure that possesses the topological interface state. Furthermore, the wave barriers are designed by using another kind of PCs with a complete band gap, which can reduce the negative effect of acousto-structural interaction at the waveguide boundaries. The topological interface state is employed for the detection of sound velocity of the mixtures of water and 1-propanol. Importantly, the sensing quantities of the topological phononic crystal sensor are robust against introduced structural perturbations.
{"title":"Topological interface states in solid/liquid phononic crystal waveguides and sensing applications","authors":"Tian-Xue Ma , Xiao-Lei Tang , Dong Li , Yue-Sheng Wang","doi":"10.1016/j.physleta.2024.130109","DOIUrl":"10.1016/j.physleta.2024.130109","url":null,"abstract":"<div><div>Topologically protected states in phononic crystals provide a new avenue to design robust acoustic devices as they are immune to structural imperfections or defects. In this work, the topological characteristics of solid/liquid phononic waveguides are investigated numerically using the finite element approach. Both the topologically trivial and non-trivial phononic crystals can be obtained by varying their geometry and hence are used for the construction of the phononic crystal structure that possesses the topological interface state. Furthermore, the wave barriers are designed by using another kind of PCs with a complete band gap, which can reduce the negative effect of acousto-structural interaction at the waveguide boundaries. The topological interface state is employed for the detection of sound velocity of the mixtures of water and 1-propanol. Importantly, the sensing quantities of the topological phononic crystal sensor are robust against introduced structural perturbations.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"530 ","pages":"Article 130109"},"PeriodicalIF":2.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-11-26DOI: 10.1016/j.physleta.2024.130097
Houria Triki , Dongmei Zhang , Qin Zhou
We present the first analytical demonstration of the existence and propagating characteristics of chirped nonautonomous periodic waves with constant background in an inhomogeneous spin-1/2 Bose-Einstein condensate system with temporally varying pair-transition effects and gain or loss. We find that such periodic waveforms can exist in cn-cn, sn-sn as well as in dn-dn configurations with background, which can transform into new kinds of nonautonomous solitons on a continuous-wave background in the long-wave limit. A key characteristic is that the amplitude, phase and width of obtained periodic waves change significantly with changes in the chirping and system parameters. As a very physically interesting application, we study the propagation dynamics of the newly found nonautonomous waves in the diffraction periodic distribution and decreasing systems.
{"title":"Novel chirped nonautonomous periodic waves in inhomogeneous spin-1/2 Bose-Einstein condensates with pair-transition effects","authors":"Houria Triki , Dongmei Zhang , Qin Zhou","doi":"10.1016/j.physleta.2024.130097","DOIUrl":"10.1016/j.physleta.2024.130097","url":null,"abstract":"<div><div>We present the first analytical demonstration of the existence and propagating characteristics of chirped nonautonomous periodic waves with constant background in an inhomogeneous spin-1/2 Bose-Einstein condensate system with temporally varying pair-transition effects and gain or loss. We find that such periodic waveforms can exist in cn-cn, sn-sn as well as in dn-dn configurations with background, which can transform into new kinds of nonautonomous solitons on a continuous-wave background in the long-wave limit. A key characteristic is that the amplitude, phase and width of obtained periodic waves change significantly with changes in the chirping and system parameters. As a very physically interesting application, we study the propagation dynamics of the newly found nonautonomous waves in the diffraction periodic distribution and decreasing systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130097"},"PeriodicalIF":2.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-11-26DOI: 10.1016/j.physleta.2024.130113
Yuxin Liu , Yanping Du , Shanshan Tan , Shuihai Dou , Zhaoyong Sun , Jun Yang
In this study, we design reconfigurable multi-phased negative Poisson's ratio metamaterial (NPM) for low-frequency vibration reduction. The designed NPMs consist of a concave hexagonal skeleton and horizontal diamond-shaped counterweights, which incorporate a base material and replaceable metal cores. By replacing these metal cores, the bandgap can be reconfigured and adjusted as needed. Finite element simulations and excitation experiments are employed to investigate the vibration suppression effects of these NPMs. The results show that the three-phase NPM has more advantages in low-frequency vibration reduction, compared with the single-phase and two-phase NPMs. When the metal core of the three-phase NPM is made of a higher-density material (lead), the lower edge of the bandgap is as low as 471.4 Hz, and the bandgap coverage below 1000 Hz reaches 36.1 %. These findings provide new ideas for low-frequency vibration reduction in engineering practice.
{"title":"Enhancement of low-frequency vibration suppression in reconfigurable multiphase negative Poisson's ratio metamaterials","authors":"Yuxin Liu , Yanping Du , Shanshan Tan , Shuihai Dou , Zhaoyong Sun , Jun Yang","doi":"10.1016/j.physleta.2024.130113","DOIUrl":"10.1016/j.physleta.2024.130113","url":null,"abstract":"<div><div>In this study, we design reconfigurable multi-phased negative Poisson's ratio metamaterial (NPM) for low-frequency vibration reduction. The designed NPMs consist of a concave hexagonal skeleton and horizontal diamond-shaped counterweights, which incorporate a base material and replaceable metal cores. By replacing these metal cores, the bandgap can be reconfigured and adjusted as needed. Finite element simulations and excitation experiments are employed to investigate the vibration suppression effects of these NPMs. The results show that the three-phase NPM has more advantages in low-frequency vibration reduction, compared with the single-phase and two-phase NPMs. When the metal core of the three-phase NPM is made of a higher-density material (lead), the lower edge of the bandgap is as low as 471.4 Hz, and the bandgap coverage below 1000 Hz reaches 36.1 %. These findings provide new ideas for low-frequency vibration reduction in engineering practice.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130113"},"PeriodicalIF":2.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Magnetic nano-sized CoFe₂O₄ spinel ferrites were synthesized using the sol-gel auto-combustion technique, and the impact of annealing temperature on their structural and magnetic properties was systematically studied. Samples were annealed at 500 °C, 700 °C, and 900 °C for 5 hours. XRD analysis confirmed crystallization in the Fd3m space group, with average crystallite sizes ranging from 30 to 34 nm. Structural parameters such as ionic radii, bond lengths, and cation distribution were also calculated, revealing partial inversion with an inversion factor of 0.68. FE-SEM analysis showed uniform morphology and increasing grain size with higher annealing temperatures. EDS confirmed stoichiometric Co and Fe ion content, while FTIR indicated strong metal-oxide bonds characteristic of CoFe₂O₄. Magnetic measurements demonstrated that higher annealing temperatures enhanced saturation magnetization and magnetocrystalline anisotropy while reducing coercivity, highlighting the significant influence of annealing temperature on CoFe₂O₄ nanoparticles' performance.
{"title":"Annealing-induced changes in Sol-Gel synthesized nano-CoFe2O4: A study of structure, morphology and magnetism","authors":"Rohit Duglet , Deepika Sharma , Anita Manhas , Dheeraj Sharma , M. Singh","doi":"10.1016/j.physleta.2024.130104","DOIUrl":"10.1016/j.physleta.2024.130104","url":null,"abstract":"<div><div>Magnetic nano-sized CoFe₂O₄ spinel ferrites were synthesized using the sol-gel auto-combustion technique, and the impact of annealing temperature on their structural and magnetic properties was systematically studied. Samples were annealed at 500 °C, 700 °C, and 900 °C for 5 hours. XRD analysis confirmed crystallization in the Fd3m space group, with average crystallite sizes ranging from 30 to 34 nm. Structural parameters such as ionic radii, bond lengths, and cation distribution were also calculated, revealing partial inversion with an inversion factor of 0.68. FE-SEM analysis showed uniform morphology and increasing grain size with higher annealing temperatures. EDS confirmed stoichiometric Co and Fe ion content, while FTIR indicated strong metal-oxide bonds characteristic of CoFe₂O₄. Magnetic measurements demonstrated that higher annealing temperatures enhanced saturation magnetization and magnetocrystalline anisotropy while reducing coercivity, highlighting the significant influence of annealing temperature on CoFe₂O₄ nanoparticles' performance.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"530 ","pages":"Article 130104"},"PeriodicalIF":2.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-11-26DOI: 10.1016/j.physleta.2024.130103
Shu Qu , Fan-Qin Xu , Bin Guo , Zhao-Yu Sun
The large-N limit is a crucial property in many-body quantum systems, playing a important role in advancing quantum theories and technologies. This paper explores the large-N limit of quantum Fisher information (QFI), an experimentally accessible quantum information measure, in one-dimensional (1D) translation-invariant quantum systems. We demonstrate that QFI generally scales as in the large-N limit for these systems. Notably, we present a method to extract the scaling coefficients using triangular-matrix-product-operator theory and infinite tensor-network algorithms, circumventing the need for finite-size scaling fittings. By analyzing ground states in infinite-size transverse-field Ising chains and cluster chains, we reveal that offer a concise and informative approach to characterize the achievable precision limit in parameter estimations, metrologically useful multipartite entanglement, quantum criticality, and their relationship in these systems in the large-N limit.
大 N 极限是多体量子系统的一个重要特性，在推动量子理论和技术发展方面发挥着重要作用。本文探讨了一维（1D）平移不变量子系统中量子费雪信息（QFI）的大 N 极限，这是一种实验上可获得的量子信息度量。我们证明，在这些系统的大 N 极限，QFI 通常以ϱ2N2+ϱ1N 的方式扩展。值得注意的是，我们提出了一种利用三角矩阵-乘积-算子理论和无限张量网络算法提取缩放系数{ϱi}的方法，从而避免了对有限大小缩放配件的需求。通过分析无限大横向场伊辛链和簇链的基态，我们发现{ϱi}提供了一种简洁而信息丰富的方法，用于描述这些系统在大N极限下参数估计的可实现精度极限、计量学上有用的多方纠缠、量子临界度以及它们之间的关系。
{"title":"Quantum Fisher information in one-dimensional translation-invariant quantum systems: Large-N limit analysis","authors":"Shu Qu , Fan-Qin Xu , Bin Guo , Zhao-Yu Sun","doi":"10.1016/j.physleta.2024.130103","DOIUrl":"10.1016/j.physleta.2024.130103","url":null,"abstract":"<div><div>The large-<em>N</em> limit is a crucial property in many-body quantum systems, playing a important role in advancing quantum theories and technologies. This paper explores the large-<em>N</em> limit of quantum Fisher information (QFI), an experimentally accessible quantum information measure, in one-dimensional (1D) translation-invariant quantum systems. We demonstrate that QFI generally scales as <span><math><msub><mrow><mi>ϱ</mi></mrow><mrow><mn>2</mn></mrow></msub><msup><mrow><mi>N</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>+</mo><msub><mrow><mi>ϱ</mi></mrow><mrow><mn>1</mn></mrow></msub><mi>N</mi></math></span> in the large-<em>N</em> limit for these systems. Notably, we present a method to extract the scaling coefficients <span><math><mo>{</mo><msub><mrow><mi>ϱ</mi></mrow><mrow><mi>i</mi></mrow></msub><mo>}</mo></math></span> using triangular-matrix-product-operator theory and infinite tensor-network algorithms, circumventing the need for finite-size scaling fittings. By analyzing ground states in infinite-size transverse-field Ising chains and cluster chains, we reveal that <span><math><mo>{</mo><msub><mrow><mi>ϱ</mi></mrow><mrow><mi>i</mi></mrow></msub><mo>}</mo></math></span> offer a concise and informative approach to characterize the achievable precision limit in parameter estimations, metrologically useful multipartite entanglement, quantum criticality, and their relationship in these systems in the large-<em>N</em> limit.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130103"},"PeriodicalIF":2.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
In this study, we explore the impact of short-range antiferromagnetic correlations on the charge density wave (CDW) phase in strongly correlated electron systems exhibiting the pseudogap phenomenon. Our investigation employs an n-pole approximation to consider the repulsive Coulomb interaction (U) and antiferromagnetic correlations. Considering an one-band Hubbard model to account for the Coulomb interaction and a BCS-like model for the CDW order parameter, we observed that an increase in U enhances antiferromagnetic fluctuations, resulting in a flattened re-normalized band around the antinodal point . The pseudogap manifests itself in the band structure and density of states, prompting exploration of various U and occupation number values. Our findings indicate that antiferromagnetic correlations significantly influence the CDW state, as the Fermi surface is reconstructed within the ordered phase. Furthermore, we found a Lifshitz transition inside both the CDW phase and the normal state, with the latter preceding the onset of the pseudogap.
在这项研究中，我们探讨了短程反铁磁相关性对表现出伪缺口现象的强相关电子系统中电荷密度波（CDW）相位的影响。我们的研究采用 n 极近似来考虑斥力库仑相互作用（U）和反铁磁相关性。考虑到库仑相互作用的单带哈伯德模型和 CDW 有序参数的类 BCS 模型，我们观察到 U 的增加会增强反铁磁波动，从而在反正交点 (π,0) 周围形成扁平的再正交带。这种伪缺口表现在带结构和态密度上，促使我们对不同的 U 值和占位数值进行探索。我们的研究结果表明，由于费米面是在有序相内重构的，因此反铁磁相关性对 CDW 状态有显著影响。此外，我们还在 CDW 相和正常态内部发现了利夫希茨转变，后者先于伪缺口的出现。
{"title":"Interplay between the charge density wave phase and a pseudogap under antiferromagnetic correlations","authors":"L.C. Prauchner , E.J. Calegari , J. Faundez , S.G. Magalhaes","doi":"10.1016/j.physleta.2024.130093","DOIUrl":"10.1016/j.physleta.2024.130093","url":null,"abstract":"<div><div>In this study, we explore the impact of short-range antiferromagnetic correlations on the charge density wave (CDW) phase in strongly correlated electron systems exhibiting the pseudogap phenomenon. Our investigation employs an n-pole approximation to consider the repulsive Coulomb interaction (<em>U</em>) and antiferromagnetic correlations. Considering an one-band Hubbard model to account for the Coulomb interaction and a BCS-like model for the CDW order parameter, we observed that an increase in <em>U</em> enhances antiferromagnetic fluctuations, resulting in a flattened re-normalized band around the antinodal point <span><math><mo>(</mo><mi>π</mi><mo>,</mo><mn>0</mn><mo>)</mo></math></span>. The pseudogap manifests itself in the band structure and density of states, prompting exploration of various <em>U</em> and occupation number values. Our findings indicate that antiferromagnetic correlations significantly influence the CDW state, as the Fermi surface is reconstructed within the ordered phase. Furthermore, we found a Lifshitz transition inside both the CDW phase and the normal state, with the latter preceding the onset of the pseudogap.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130093"},"PeriodicalIF":2.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-11-26DOI: 10.1016/j.physleta.2024.130110
Haiyan Shan, Jing Liang, Wenjie Pi
The fluctuation of resource supply and demand among symbiotic members may bring great risks to an industrial symbiosis network (ISN). To address this, uninfected enterprises can provide risk sharing assistance to infected enterprises, helping them mitigating risks. This study aims to explore the impact of risk sharing on risk propagation in multiplex networks. We propose a mechanism for risk sharing and risk propagation, employing the Microscopic Markov Chain Approach (MMCA) to investigate the evolution process of risk propagation, while examing the influence of related factors through numerical simulation. Results show that risk sharing behavior facilitates risk information propagation, and promotes the recovery of infected nodes. However, higher risk aversion probability negatively affect risk mitigation under SP strategy or DP strategy, while it has the opposite effect under RS strategy. Furthermore, increasing risk sharing probability can improve the risk propagation threshold, which is more significant under SP strategy and DP strategy.
{"title":"The impact of risk sharing on risk propagation in multiplex networks: A dynamic simulation on industrial symbiosis","authors":"Haiyan Shan, Jing Liang, Wenjie Pi","doi":"10.1016/j.physleta.2024.130110","DOIUrl":"10.1016/j.physleta.2024.130110","url":null,"abstract":"<div><div>The fluctuation of resource supply and demand among symbiotic members may bring great risks to an industrial symbiosis network (ISN). To address this, uninfected enterprises can provide risk sharing assistance to infected enterprises, helping them mitigating risks. This study aims to explore the impact of risk sharing on risk propagation in multiplex networks. We propose a mechanism for risk sharing and risk propagation, employing the Microscopic Markov Chain Approach (MMCA) to investigate the evolution process of risk propagation, while examing the influence of related factors through numerical simulation. Results show that risk sharing behavior facilitates risk information propagation, and promotes the recovery of infected nodes. However, higher risk aversion probability negatively affect risk mitigation under SP strategy or DP strategy, while it has the opposite effect under RS strategy. Furthermore, increasing risk sharing probability can improve the risk propagation threshold, which is more significant under SP strategy and DP strategy.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"529 ","pages":"Article 130110"},"PeriodicalIF":2.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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