arXiv - PHYS - Quantum Gases最新文献_第6页

Quantum protocols in demixed dipolar BEC mixtures in 1D 一维去混合双极 BEC 混合物中的量子协议

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-29 DOI: arxiv-2407.20467

C. Madroñero, R. Paredes

引用次数: 0

Dynamical signatures of the Yang-Lee edge singularity in non-Hermitian systems 非赫米提系统中杨-李边缘奇点的动力学特征

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-29 DOI: arxiv-2407.20106

Ming-Chu Lu, Shun-Hui Shi, Gaoyong Sun

引用次数: 0

Superfluid Spin-up: 3D Simulations of Postglitch Dynamics in Neutron Stars Cores 超流体自旋：中子星内核隙后动力学的三维模拟

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-26 DOI: arxiv-2407.18810

J. R. Fuentes, Vanessa Graber

{"title":"Superfluid Spin-up: 3D Simulations of Postglitch Dynamics in Neutron Stars Cores","authors":"J. R. Fuentes, Vanessa Graber","doi":"arxiv-2407.18810","DOIUrl":"https://doi.org/arxiv-2407.18810","url":null,"abstract":"Following a glitch, a neutron star interior undergoes a transfer of angular\u0000momentum from the star's crust to the core, resulting in the spin-up of the\u0000latter. The crust-core coupling, which determines how quickly this spin-up\u0000proceeds, can be achieved through various physical processes, including Ekman\u0000pumping, superfluid vortex-mediated mutual friction, and magnetic fields. While\u0000the complexity of the problem has hindered studies of the mechanisms' combined\u0000action, analytical work on individual processes suggests different spin-up\u0000timescales depending on the relative strength of Coriolis, viscous, and mutual\u0000friction forces, and the magnetic field, respectively. However, experimental\u0000and numerical validations of these results are limited. In this paper, we focus\u0000on viscous effects and mutual friction and conduct non-linear hydrodynamical\u0000simulations of the spin-up problem in a two-component fluid by solving the\u0000incompressible Hall$-$Vinen$-$Bekarevich$-$Khalatnikov (HVBK) equations in the\u0000full sphere (i.e., including $r=0$) for the first time. We find that the\u0000viscous (normal) component accelerates due to Ekman pumping, although the\u0000mutual friction coupling to the superfluid component alters the spin-up\u0000dynamics compared to the single-fluid scenario. Close to the sphere's surface,\u0000the response of the superfluid is accurately described by the mutual friction\u0000timescale irrespective of its coupling strength with the normal component.\u0000However, as we move deeper into the sphere, the superfluid accelerates on\u0000different timescales due to the slow viscous spin-up of the internal normal\u0000fluid layers. We discuss potential implications for neutron stars and\u0000requirements for future work to build more realistic models.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"213 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870150","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

Equation of state of Bose gases beyond the universal regime 超越普适机制的玻色气体状态方程

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-25 DOI: arxiv-2407.18059

Marti Planasdemunt, Jordi Pera, Jordi Boronat

引用次数: 0

Hidden vortices and Feynman rule in Bose-Einstein condensates with density-dependent gauge potential 具有密度相关规势的玻色-爱因斯坦凝聚体中的隐涡和费曼规则

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-25 DOI: arxiv-2407.17901

Ishfaq Ahmad Bhat, Bishwajyoti Dey

{"title":"Hidden vortices and Feynman rule in Bose-Einstein condensates with density-dependent gauge potential","authors":"Ishfaq Ahmad Bhat, Bishwajyoti Dey","doi":"arxiv-2407.17901","DOIUrl":"https://doi.org/arxiv-2407.17901","url":null,"abstract":"In this article, we numerically investigate the vortex nucleation in a\u0000Bose-Einstein condensate trapped in a double-well potential and subjected to a\u0000density-dependent gauge potential. A rotating Bose-Einstein condensate, when\u0000confined in a double-well potential, not only gives rise to visible vortices\u0000but also produces hidden vortices. We have empirically developed the Feynmans\u0000rule for the number of vortices versus angular momentum in Bose-Einstein\u0000condensates in presence of the density dependent-gauge potentials. The\u0000variation of the average angular momentum with the number of vortices is also\u0000sensitive to the nature of the nonlinear rotation due to the density-dependent\u0000gauge potentials. The empirical result agrees well with the numerical\u0000simulations and the connection is verified by means of curve fitting analysis.\u0000The modified Feynman rule is further confirmed for the BECs confined in\u0000harmonic and toroidal traps. In addition, we show the nucleation of vortices in\u0000double-well and toroidally confined Bose-Einstein condensates solely through\u0000nonlinear rotations (without any trap rotation) arising through the density\u0000dependent-gauge potential.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785071","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

Universal clusters in quasi-two-dimensional ultracold Fermi mixtures 准二维超冷费米混合物中的通用团簇

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-25 DOI: arxiv-2407.17702

Ruijin Liu, Tingting Shi, Matteo Zaccanti, Xiaoling Cui

{"title":"Universal clusters in quasi-two-dimensional ultracold Fermi mixtures","authors":"Ruijin Liu, Tingting Shi, Matteo Zaccanti, Xiaoling Cui","doi":"arxiv-2407.17702","DOIUrl":"https://doi.org/arxiv-2407.17702","url":null,"abstract":"We study universal clusters in quasi-two dimensions (q2D) that consist of a\u0000light (L) atom interacting with two or three heavy (H) identical fermions,\u0000forming the trimer or tetramer bound state. The axial confinement in q2D is\u0000shown to lift the three-fold degeneracy of 3D trimer (tetramer) in $p$-wave\u0000channel and uniquely select the ground state with magnetic angular momentum\u0000$|m|=1$ ($m=0$). By varying the interaction or confinement strength, we explore\u0000the dimensional crossover of these clusters from 3D to 2D, characterized by a\u0000gradual change of critical H-L mass ratio for their emergence and\u0000momentum-space distribution. Importantly, we find that a finite effective range\u0000will {it not} alter their critical mass ratios in the weak coupling regime.\u0000There, we establish an effective 2D model to quantitatively reproduce the\u0000properties of q2D clusters, and further identify the optimal interaction\u0000strengths for their detections in experiments. Our results suggest a promising\u0000prospect for observing universal clusters and associated high-order correlation\u0000effects in realistic q2D ultracold Fermi mixtures.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785072","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

Massive-vortex realization of a Bosonic Josephson Junction 实现玻色约瑟夫森结的大规模涡流

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-24 DOI: arxiv-2407.17080

Alice Bellettini, Andrea Richaud, Vittorio Penna

{"title":"Massive-vortex realization of a Bosonic Josephson Junction","authors":"Alice Bellettini, Andrea Richaud, Vittorio Penna","doi":"arxiv-2407.17080","DOIUrl":"https://doi.org/arxiv-2407.17080","url":null,"abstract":"We study the mass exchange between two rotating, quantum massive vortices in\u0000a two-component Bose-Einstein condensate. The vortices, in the majority\u0000component, exhibit a filled core, where the in-filling minority component\u0000undergoes a quantum tunneling effect. Remarkably, we observe that the\u0000two-vortex system features stable Josephson oscillations, as well as all the\u0000nonlinear phenomena, including the macroscopic quantum self-trapping, that\u0000characterize a Bosonic Josephson Junction (BJJ). We propose an analytical model\u0000for describing the inter-vortex tunneling, obtained by implementing the a\u0000coherent-state representation of the two-mode Bose-Hubbard model. This allows\u0000us to give the explicit expression of the model's parameters in terms of the\u0000physical macroscopic parameters of the two-vortex system. The comparison of the\u0000dynamical scenario predicted by the model with that emerging from the\u0000Gross-Pitaevskii equations is very good for sufficiently small particle\u0000numbers, while at larger particle numbers it grows less precise, presumably due\u0000to the partial exclusion of the many-body interactions from our model. The\u0000definition of an effective self-interaction parameter allows us to include the\u0000many-body effects, thus restoring a quite good agreement with the numerical\u0000results. Interestingly, the recognition of the bosonic Josephson dynamics paves\u0000the way to the investigation of new dynamical behaviors in multi-vortex\u0000configurations.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141771211","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

Necklace Ansatz for strongly repulsive spin mixtures on a ring 环上强斥力自旋混合物的项链公式

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-23 DOI: arxiv-2407.16618

Gianni Aupetit-Diallo, Giovanni Pecci, Artem Volosniev, Mathias Albert, Anna Minguzzi, Patrizia Vignolo

引用次数: 0

Tunable nonlinear Landau-Zener tunnelings in a spin-orbit-coupled spinor Bose-Einstein condensate 自旋轨道耦合自旋玻色-爱因斯坦凝聚体中的可调谐非线性朗道-齐纳隧道效应

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-23 DOI: arxiv-2407.16109

Zhiqian Gui, Jin Su, Hao Lyu, Yongping Zhang

引用次数: 0

Topological floating phase of dipolar bosons in an optical ladder 光梯中双极玻色子的拓扑浮相

arXiv - PHYS - Quantum Gases Pub Date : 2024-07-22 DOI: arxiv-2407.15710

Henning Korbmacher, Gustavo A. Domínguez-Castro, Mateusz Łącki, Jakub Zakrzewski, Luis Santos

引用次数: 0