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Lattice dynamics in the FeSi-based family of superconductors 硅铁基超导体家族的晶格动力学
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-05-27 DOI: 10.1209/0295-5075/ad3b37
S. Layek, M. F. Hansen, J.-B. Vaney, P. Toulemonde, S. Tencé, P. Boullay, A. Cano and M.-A. Méasson
{"title":"Lattice dynamics in the FeSi-based family of superconductors","authors":"S. Layek, M. F. Hansen, J.-B. Vaney, P. Toulemonde, S. Tencé, P. Boullay, A. Cano and M.-A. Méasson","doi":"10.1209/0295-5075/ad3b37","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3b37","url":null,"abstract":"The lattice dynamics of the superconducting materials LaFeSiH and LaFeSiO1-δ as well as their intermetallic precursor LaFeSi are investigated by polarized Raman spectroscopy and first-principles calculations, together with X-ray and advanced electron diffraction techniques for their structural analysis. We find that the Fe-dominated Raman-active modes reflect the chemical peculiarities of these silicides compared to their pnictide counterparts, with enhanced structural couplings between the FeSi layer and the spacer that can be related to the ionic vs. covalent character of the latter. In addition, we find signatures of enhanced electron-phonon coupling for some of the Raman-active modes. Beyond that, our study reveals intriguing Fe-based Raman features as well as structural subtleties in LaFeSiH suggesting that this superconductor may formally be non-centrosymmetric.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"53 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141167595","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 information-theoretic analog of the twin paradox 孪生悖论的信息论类比
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-05-27 DOI: 10.1209/0295-5075/ad3eae
Mladen Kovačević, Iosif Pinelis and Marios Kountouris
{"title":"An information-theoretic analog of the twin paradox","authors":"Mladen Kovačević, Iosif Pinelis and Marios Kountouris","doi":"10.1209/0295-5075/ad3eae","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3eae","url":null,"abstract":"We revisit the familiar scenario involving two parties in relative motion, in which Alice stays at rest while Bob goes on a journey at speed βc along an arbitrary trajectory and reunites with Alice after a certain period of time. It is a well-known consequence of special relativity that the time that passes until they meet again is different for the two parties and is shorter in Bob's frame by a factor of . We investigate how this asymmetry manifests itself from an information-theoretic viewpoint. Assuming that Alice and Bob transmit signals of equal average power to each other during the whole journey, and that additive white Gaussian noise is present at both sides, we show that the maximum number of bits per second that Alice can transmit reliably to Bob is always higher than the one Bob can transmit to Alice. Equivalently, the energy per bit invested by Alice is lower than that invested by Bob, meaning that the traveler is less efficient from the communication perspective, as conjectured by Jarett and Cover.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"11 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141167592","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
Entanglement preservation in tripartite quantum systems under dephasing dynamics 三方量子系统在去相动态下的纠缠保持
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-05-19 DOI: 10.1209/0295-5075/ad3eac
Chandrashekar Radhakrishnan, Sovik Roy, Ravikumar Chinnarasu and Md. Manirul Ali
{"title":"Entanglement preservation in tripartite quantum systems under dephasing dynamics","authors":"Chandrashekar Radhakrishnan, Sovik Roy, Ravikumar Chinnarasu and Md. Manirul Ali","doi":"10.1209/0295-5075/ad3eac","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3eac","url":null,"abstract":"Protecting entanglement from decoherence is a critical aspect of quantum information processsing. For many-body quantum systems evolving under decoherence, estimating multipartite entanglement is challenging. This challenge can be met up by considering a distance-based measure such as relative entropy of entanglement which decisively measures entanglement in both pure as well as mixed states. In this work, we investigate the tripartite entanglement dynamics of pure and mixed states in the presence of a structured dephasing environment at finite temperature. We show that the robustness of the quantum system to decoherence is dependent on the distribution of entanglement and its relation to different configurations of the bath. If the bath is structured individually such that each qubit has its own environment, the system has different dynamics compared to when the bath is common to all the three qubits. From the results we conjecture that there is a connection between the distribution of entanglement among the qubits and the distribution of bath degrees of freedom, and the interplay of these two distributions determines the decay rate of the entanglement dynamics. The sustainability of tripartite entanglement is shown to be enhanced significantly in the presence of reservoir memory.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"69 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141153461","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
Mean-field analysis of the glassy dynamics of an elastoplastic model of super-cooled liquids 超冷液体弹塑性模型玻璃化动力学的均方场分析
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-05-14 DOI: 10.1209/0295-5075/ad3b35
J. W. Baron and G. Biroli
{"title":"Mean-field analysis of the glassy dynamics of an elastoplastic model of super-cooled liquids","authors":"J. W. Baron and G. Biroli","doi":"10.1209/0295-5075/ad3b35","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3b35","url":null,"abstract":"We present a mean-field theory of a coarse-grained model of a super-cooled liquid in which relaxation occurs via local plastic rearrangements. Local relaxation can be induced by thermal fluctuations or by the long-range elastic consequences of other rearrangements. We extract the temperature dependence of both the relaxation time and the length scale of dynamical correlations. We find two dynamical regimes. First, a regime in which the characteristic time and length scales diverge as a power law at a critical temperature Tc. This regime is found by an approximation that neglects activated relaxation channels, which can be interpreted as akin to the one found by the mode-coupling transition of glasses. In reality, only a crossover takes place at Tc. The residual plastic activity leads to a second regime characterised by an Arrhenius law below Tc. In this case, we show that the length scale governing dynamical correlations diverges as a power law as , and is logarithmically related to the relaxation time.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"25 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141061000","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
The doomsday of black hole evaporation 黑洞蒸发的末日
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-05-13 DOI: 10.1209/0295-5075/ad3b36
Shao-Jiang Wang
{"title":"The doomsday of black hole evaporation","authors":"Shao-Jiang Wang","doi":"10.1209/0295-5075/ad3b36","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3b36","url":null,"abstract":"By assuming simultaneously the unitarity of the Hawking evaporation and the universality of Bekenstein entropy bound as well as the validity of cosmic censorship conjecture, we find that the black hole evaporation rate could evolve from the usual inverse square law in black hole mass into a constant evaporation rate near the end of the Hawking evaporation before quantum gravity could come into play, inferring a slightly longer lifetime for lighter black holes.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"45 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140936558","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
The influence patterns of carbon flux in different climatic zones in China —Based on the complex network approach 中国不同气候区碳通量的影响模式--基于复杂网络方法
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-05-06 DOI: 10.1209/0295-5075/ad397d
Ting Qing, Fan Wang, Ruijin Du, Gaogao Dong and Lixin Tian
{"title":"The influence patterns of carbon flux in different climatic zones in China —Based on the complex network approach","authors":"Ting Qing, Fan Wang, Ruijin Du, Gaogao Dong and Lixin Tian","doi":"10.1209/0295-5075/ad397d","DOIUrl":"https://doi.org/10.1209/0295-5075/ad397d","url":null,"abstract":"Research on ecosystem carbon flux can provide important methodological and strategic support for climate change mitigation. The existing studies focus on the calculation of carbon flux, ignoring the intertwined effects between regions. The quantification and analysis of the interaction patterns of carbon flux is crucial for understanding the global carbon cycle process, forecasting and coping with climate change. In this study, carbon flux network model sequences are established based on complex network theory using carbon flux data spanning from December 1, 2005, to November 30, 2020. The time delay effect is introduced to accurately quantify the influence patterns of carbon flux within climate zones across China. The findings indicate that the probability distribution function of the link weights during the various seasons of each year exhibits a bimodal distribution with distinct positive and negative components. The delay probability distribution function reveals the significant impact of delay effects, which are especially pronounced and mostly significant long-term lag effects in nodes with negative weights. Further, the results of the interactions of carbon flux among climate zones demonstrate that changes in carbon flux in the plateau and southern temperate regions have either positive or negative impacts on other climate zones. Therefore, controlling carbon flux changes in these climatic zones can effectively optimize the distribution of carbon flux. The modeling framework and results presented in this paper provide useful insights for the regulation and distribution optimization of carbon flux in China.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"15 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140886654","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
Stochastic thermodynamics of a probe in a fluctuating correlated field 波动相关场中探针的随机热力学
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-05-01 DOI: 10.1209/0295-5075/ad3469
Davide Venturelli, Sarah A. M. Loos, Benjamin Walter, Édgar Roldán and Andrea Gambassi
{"title":"Stochastic thermodynamics of a probe in a fluctuating correlated field","authors":"Davide Venturelli, Sarah A. M. Loos, Benjamin Walter, Édgar Roldán and Andrea Gambassi","doi":"10.1209/0295-5075/ad3469","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3469","url":null,"abstract":"We develop a framework for the stochastic thermodynamics of a probe coupled to a fluctuating medium with spatio-temporal correlations, described by a scalar field. For a Brownian particle dragged by a harmonic trap through a fluctuating Gaussian field, we show that near criticality (where the field displays long-range spatial correlations) the spatially-resolved average heat flux develops a dipolar structure, where heat is absorbed in front and dissipated behind the dragged particle. Moreover, a perturbative calculation reveals that the dissipated power displays three distinct dynamical regimes depending on the drag velocity.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"45 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140840407","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
Quantum thermometry based on interferometric power 基于干涉功率的量子测温技术
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-04-30 DOI: 10.1209/0295-5075/ad3c2f
Hongying Yang, Qiang Zheng, Ping Yue and Qijun Zhi
{"title":"Quantum thermometry based on interferometric power","authors":"Hongying Yang, Qiang Zheng, Ping Yue and Qijun Zhi","doi":"10.1209/0295-5075/ad3c2f","DOIUrl":"https://doi.org/10.1209/0295-5075/ad3c2f","url":null,"abstract":"In the field of quantum thermometry, usually temperature is estimated by the framework of quantum metrology. In this work, an alternative approach to quantum thermometry is suggested, based on interferometric power (IP). IP is defined as the worst-case quantum Fisher information in a double-channel interferometer. Specifically, the time evolution of the IP for a two-qubit state as a probe contacting with a finite-temperature bath is considered. The IP dynamics of the probe with three kinds of initial states (i.e., entangled, separable, and mixed) strongly depend on the bath temperature. The dynamical evolution of IP would be measured experimentally, considering that the IP is a measurable quantity in the experiment. Thus, the IP dynamics can be adopted to extract the value of the bath temperature directly. In this sense, the IP could be exploited as a quantum thermometer.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"8 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140840404","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
Topological defects and boundary states in four-dimensional topological insulator 四维拓扑绝缘体中的拓扑缺陷和边界态
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-04-28 DOI: 10.1209/0295-5075/ad397c
Zhi-Wen Chang, Wei-Chang Hao and Xin Liu
{"title":"Topological defects and boundary states in four-dimensional topological insulator","authors":"Zhi-Wen Chang, Wei-Chang Hao and Xin Liu","doi":"10.1209/0295-5075/ad397c","DOIUrl":"https://doi.org/10.1209/0295-5075/ad397c","url":null,"abstract":"We show the connection between the second Chern number and topological defects, in a (4+1)-dimensional time-reversal invariant Dirac lattice model. It is discovered that two types of topological defects, the five-dimensional (5D) and four-dimensional (4D) point defects arise from the singular points of wave functions together with the geometric meaning of the second Chern number. We demonstrated that the 5D point defects appear at the band crossing positions with a topological transition, leading to a jump of the second Chern number. The 4D point defects exist in an insulating bulk, whose topological charges can give the evaluations of the second Chern number of energy bands. Finally, we discussed the possible structures of the boundary states in the light of the realization way of the 4D model. Our theory provides not only a new perspective to grasp the second Chern number, but also a simple approach to derive its values without calculating any integrals.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"20 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140840555","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
Steady-state selection in multi-species driven diffusive systems 多物种驱动扩散系统中的稳态选择
IF 1.8 4区 物理与天体物理
EPL Pub Date : 2024-04-21 DOI: 10.1209/0295-5075/ad30cd
Luigi Cantini and Ali Zahra
{"title":"Steady-state selection in multi-species driven diffusive systems","authors":"Luigi Cantini and Ali Zahra","doi":"10.1209/0295-5075/ad30cd","DOIUrl":"https://doi.org/10.1209/0295-5075/ad30cd","url":null,"abstract":"We introduce a general method to determine the large-scale non-equilibrium steady-state properties of one-dimensional multi-species driven diffusive systems with open boundaries, generalizing thus the max-min current principle known for systems with a single type of particles. This method is based on the solution of the Riemann problem of the associated system of conservation laws. We demonstrate that the effective density of a reservoir depends not only on the corresponding boundary hopping rates but also on the dynamics of the entire system, emphasizing the interplay between bulk and reservoirs. We highlight the role of Riemann variables in establishing the phase diagram of such systems. We apply our method to three models of multi-species interacting particle systems and compare the theoretical predictions with numerical simulations.","PeriodicalId":11738,"journal":{"name":"EPL","volume":"24 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140801036","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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