arXiv - PHYS - Quantum Gases最新文献_第7页

Geometric phase and multipartite entanglement of Rydberg atom chains 雷德贝格原子链的几何相位和多方纠缠

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-20 DOI: arxiv-2407.14854

Chang-Yan Wang

{"title":"Geometric phase and multipartite entanglement of Rydberg atom chains","authors":"Chang-Yan Wang","doi":"arxiv-2407.14854","DOIUrl":"https://doi.org/arxiv-2407.14854","url":null,"abstract":"We investigate the behavior of geometric phase (GP) and geometric\u0000entanglement (GE), a multipartite entanglement measure, across quantum phase\u0000transitions in Rydberg atom chains. Using density matrix renormalization group\u0000calculations and finite-size scaling analysis, we characterize the critical\u0000properties of transitions between disordered and ordered phases. Both\u0000quantities exhibit characteristic scaling near transition points, with the\u0000disorder to $Z_2$ ordered phase transition showing behavior consistent with the\u0000Ising universality class, while the disorder to $Z_3$ phase transition displays\u0000distinct critical properties. We demonstrate that GP and GE serve as sensitive\u0000probes of quantum criticality, providing consistent critical parameters and\u0000scaling behavior. A unifying description of these geometric quantities from a\u0000quantum geometry perspective is explored, and an interferometric setup for\u0000their potential measurement is discussed. Our results provide insights into the\u0000interplay between geometric phase and multipartite entanglement near quantum\u0000phase transitions in Rydberg atom systems, revealing how these quantities\u0000reflect the underlying critical behavior in these complex quantum many-body\u0000systems.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785069","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}

引用次数: 0

Dynamical Transition of Quantum Vortex-Pair Annihilation in a Bose-Einstein Condensate 玻色-爱因斯坦凝聚态中量子涡对湮灭的动态转变

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-19 DOI: arxiv-2407.14627

Toshiaki Kanai, Chuanwei Zhang

{"title":"Dynamical Transition of Quantum Vortex-Pair Annihilation in a Bose-Einstein Condensate","authors":"Toshiaki Kanai, Chuanwei Zhang","doi":"arxiv-2407.14627","DOIUrl":"https://doi.org/arxiv-2407.14627","url":null,"abstract":"Understanding the elementary mechanism for the dissipation of vortex energy\u0000in quantum liquids is one central issue in quantum hydrodynamics, such as\u0000quantum turbulence in systems ranging from neutron stars to atomic condensates.\u0000In a two-dimensional (2D) Bose-Einstein condensate (BEC) at zero temperature,\u0000besides the vortex drift-out process from the boundary, vortex-antivortex pair\u0000can annihilate in the bulk, but controversy remains on the number of vortices\u0000involved in the annihilation process. We find there exists a dynamical\u0000transition from four-body to three-body vortex annihilation processes with the\u0000time evolution in a boundary-less uniform quasi-2D BEC. Such dynamical\u0000transition depends on the initial vortex pair density, and occurs when the\u0000sound waves generated in the vortex annihilation process surpass a critical\u0000energy. With the confinement along the third direction is relaxed in a quasi-2D\u0000BEC, the critical sound wave energy decreases due to the 3D vortex line curve\u0000and reconnection, shifting the dynamical transition to the early time. Our work\u0000reveals an elementary mechanism for the dissipation of vortex energy that may\u0000help understand exotic matter and dynamics in quantum liquids.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141771201","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}

引用次数: 0

Interaction effects on the itinerant ferromagnetism phase transition 巡回铁磁相变的相互作用效应

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-19 DOI: arxiv-2407.14137

Jordi Pera, Joaquim Casulleras, Jordi Boronat

引用次数: 0

Magnetic-field-tunable anisotropic black-body radiation in dynamical axion insulators 动态轴向绝缘体中的磁场可调谐各向异性黑体辐射

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-18 DOI: arxiv-2407.16705

Eric Kochems, Gretel Quintero Angulo, Reinhold Egger, Carsten Müller, Selym Villalba-Chávez

引用次数: 0

Effect of strong confinement on the order parameter dynamics in fermionic superfluids 强约束对费米子超流体中阶参数动态的影响

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-17 DOI: arxiv-2407.12645

Cesar R. Cabrera, René Henke, Lukas Broers, Jim Skulte, H. P. Ojeda Collado, Hauke Biss, Ludwig Mathey, Henning Moritz

{"title":"Effect of strong confinement on the order parameter dynamics in fermionic superfluids","authors":"Cesar R. Cabrera, René Henke, Lukas Broers, Jim Skulte, H. P. Ojeda Collado, Hauke Biss, Ludwig Mathey, Henning Moritz","doi":"arxiv-2407.12645","DOIUrl":"https://doi.org/arxiv-2407.12645","url":null,"abstract":"Fermionic pairing and the superfluid order parameter change dramatically in\u0000low-dimensional systems such as high-T$_c$ superconductors. Here we show how\u0000the order parameter dynamics, which defines essential collective properties, is\u0000modified by strong confinement. Using a model system for strongly correlated\u0000superfluidity, an ultracold fermionic gas, we study the response to a weak\u0000modulation of the confinement. Surprisingly, we observe a well-defined\u0000collective mode throughout the entire crossover from the\u0000Bardeen-Cooper-Schrieffer (BCS) state to Bose-Einstein condensation (BEC) of\u0000molecules. Starting in the BCS regime, the excitation energy follows twice the\u0000pairing gap, then drops below it in the strongly correlated regime, and finally\u0000approaches twice the harmonic level spacing imposed by the confinement in the\u0000BEC regime. Its spectral weight vanishes when approaching the superfluid\u0000critical temperature. The experimental results are in excellent agreement with\u0000an effective field theory, providing strong evidence that amplitude\u0000oscillations of the order parameter hybridize with and eventually transform\u0000into spatial excitations along the confined direction. The strong modification\u0000of the excitation spectrum highlights the relevance of confinement to fermionic\u0000superfluids and superconductors, and raises questions about its influence on\u0000other fundamental quantities.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"92 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738245","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}

引用次数: 0

Optical pumping through the Liouvillian skin effect 通过刘易斯皮肤效应进行光泵浦

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-17 DOI: arxiv-2407.12303

De-Huan Cai, Wei Yi, Chen-Xiao Dong

{"title":"Optical pumping through the Liouvillian skin effect","authors":"De-Huan Cai, Wei Yi, Chen-Xiao Dong","doi":"arxiv-2407.12303","DOIUrl":"https://doi.org/arxiv-2407.12303","url":null,"abstract":"The Liouvillian skin effect describes the boundary affinity of Liouvillian\u0000eignemodes that originates from the intrinsic non-Hermiticity of the\u0000Liouvillian superoperators. Dynamically, it manifests as directional flow in\u0000the transient dynamics, and the accumulation of population near open boundaries\u0000at long times. Intriguingly, similar dynamic phenomena exist in the well-known\u0000process of optical pumping, where the system is driven into a desired state (or\u0000a dark-state subspace) through the interplay of dissipation and optical drive.\u0000In this work, we show that typical optical pumping processes can indeed be\u0000understood in terms of the Liouvillian skin effect. By studying the Liouvillian\u0000spectra under different boundary conditions, we reveal that the Liouvillian\u0000spectra of the driven-dissipative pumping process sensitively depend on the\u0000boundary conditions in the state space, a signature that lies at the origin of\u0000the Liouvillian skin effect. Such a connection provides insights and practical\u0000means for designing efficient optical-pumping schemes through engineering\u0000Liouvillian gaps under the open-boundary condition. Based on these\u0000understandings, we show that the efficiency of a typical side-band cooling\u0000scheme for trapped ions can be dramatically enhanced by introducing\u0000counterintuitive dissipative channels. Our results provide a useful perspective\u0000for optical pumping, with interesting implications for state preparation and\u0000cooling.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"94 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141746069","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}

引用次数: 0

Thermodynamics and density fluctuations in a bilayer Hubbard system of ultracold atoms 超冷原子双层哈巴系统的热力学和密度波动

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-16 DOI: arxiv-2407.11863

J. Samland, N. Wurz, M. Gall, M. Köhl

引用次数: 0

Coherence of a non-equilibrium polariton condensate across the interaction-mediated phase transition 跨越相互作用介导的相变的非平衡极化子凝聚态的相干性

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-15 DOI: arxiv-2407.10506

P. Comaron, E. Estrecho, M. Wurdack, M. Pieczarka, M. Steger, D. W. Snoke, K. West, L. N. Pfeiffer, A. G. Truscott, M. Matuszewski, M. Szymanska, E. A. Ostrovskaya

{"title":"Coherence of a non-equilibrium polariton condensate across the interaction-mediated phase transition","authors":"P. Comaron, E. Estrecho, M. Wurdack, M. Pieczarka, M. Steger, D. W. Snoke, K. West, L. N. Pfeiffer, A. G. Truscott, M. Matuszewski, M. Szymanska, E. A. Ostrovskaya","doi":"arxiv-2407.10506","DOIUrl":"https://doi.org/arxiv-2407.10506","url":null,"abstract":"The emergence of spatial coherence in a confined two-dimensional Bose gas of\u0000exciton-polaritons with tuneable interactions offers a unique opportunity to\u0000explore the role of interactions in a phase transition in a driven-dissipative\u0000quantum system, where both the phase transition and thermalisation are mediated\u0000by interactions. We investigate, experimentally and numerically, the phase\u0000correlations and steady-state properties of the gas over a wide range of\u0000interaction strengths by varying the photonic/excitonic fraction of the\u0000polaritons and their density. We find that the first order spatial coherence\u0000function exhibits algebraic decay consistent with the\u0000Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Surprisingly, the\u0000exponent of the algebraic decay is inversely proportional to the coherent\u0000density of polaritons, in analogy to equilibrium superfluids above the BKT\u0000transition, but with a different proportionality constant. Our work paves the\u0000way for future investigations of the phenomenon of phase transitions and\u0000superfluidity in a driven-dissipative setting","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718334","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}

引用次数: 0

Quantum droplet speed management and supersolid behavior in external harmonic confinement 外部谐波约束中的量子液滴速度管理和超固体行为

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-15 DOI: arxiv-2407.10463

Saurab Das, Ajay Nath

引用次数: 0

Non-equilibrium dynamics and atom-pair coherence in strongly interacting Bose-Fermi mixtures 强相互作用玻色-费米混合物中的非平衡动力学和原子对相干性

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-12 DOI: arxiv-2407.09176

J. van de Kraats, D. J. M. Ahmed-Braun, V. E. Colussi, S. J. J. M. F. Kokkelmans

{"title":"Non-equilibrium dynamics and atom-pair coherence in strongly interacting Bose-Fermi mixtures","authors":"J. van de Kraats, D. J. M. Ahmed-Braun, V. E. Colussi, S. J. J. M. F. Kokkelmans","doi":"arxiv-2407.09176","DOIUrl":"https://doi.org/arxiv-2407.09176","url":null,"abstract":"Theoretical treatments of non-equilibrium dynamics in strongly interacting\u0000Bose-Fermi mixtures are complicated by the inherent non-Gaussian nature of the\u0000vacuum two-body physics, invalidating the typical Hartree-Fock-Bogoliubov\u0000approximation. Here, we apply the cumulant expansion to study non-equilibrium\u0000Bose-Fermi mixtures, which allows us to explicitly include the missing\u0000non-Gaussian quantum correlations, leading to a consistent dynamical theory of\u0000a Bose-Fermi mixture near an interspecies Feshbach resonance. We first apply\u0000our theory to a study of atom-pair coherence in the gas, which is significantly\u0000enhanced by the competing influences of the Fermi sea and Bose-Einstein\u0000condensation, in agreement with analytical calculations. Then, we study the\u0000depletion of a degenerate Bose-Fermi mixture following a quench to the unitary\u0000regime, characterizing the resulting depletion of the Bose-Einstein condensate,\u0000the deformation of the Fermi surface, and the production of molecules. We find\u0000that at early times, the population dynamics scale quadratically with the hold\u0000time, and define an associated characteristic timescale set by the parameters\u0000of the mixture and the width of the Feshbach resonance.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718338","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}

引用次数: 0