arXiv - PHYS - Quantum Gases最新文献_第3页

Many-body phases from effective geometrical frustration and long-range interactions in a subwavelength lattice 亚波长晶格中来自有效几何挫折和长程相互作用的多体相位

arXiv - PHYS - Quantum Gases Pub Date : 2024-09-02 DOI: arxiv-2409.01443

Domantas Burba, Gediminas Juzeliūnas, Ian B. Spielman, Luca Barbiero

引用次数: 0

When does a Fermi puddle become a Fermi sea? Emergence of Pairing in Two-Dimensional Trapped Mesoscopic Fermi Gases 费米水坑何时变成费米海洋？二维陷波介观费米气体中配对的出现

arXiv - PHYS - Quantum Gases Pub Date : 2024-08-30 DOI: arxiv-2408.17015

Emma Laird, Brendan Mulkerin, Jia Wang, Matthew Davis

{"title":"When does a Fermi puddle become a Fermi sea? Emergence of Pairing in Two-Dimensional Trapped Mesoscopic Fermi Gases","authors":"Emma Laird, Brendan Mulkerin, Jia Wang, Matthew Davis","doi":"arxiv-2408.17015","DOIUrl":"https://doi.org/arxiv-2408.17015","url":null,"abstract":"Pairing lies at the heart of superfluidity in fermionic systems. Motivated by\u0000recent experiments in mesoscopic Fermi gases, we study up to six fermionic\u0000atoms with equal masses and equal populations in two different spin states,\u0000confined in a quasi-two-dimensional harmonic trap. We couple a stochastic\u0000variational approach with the use of an explicitly correlated Gaussian basis\u0000set, which enables us to obtain highly accurate energies and structural\u0000properties. Utilising two-dimensional two-body scattering theory with a\u0000finite-range Gaussian interaction potential, we tune the effective range to\u0000model realistic quasi-two-dimensional scattering. We calculate the excitation\u0000spectrum, pair correlation function, and paired fraction as a function of\u0000increasing attractive interaction strength. For up to six fermions in the\u0000ground state, we find that opposite spin and momentum pairing is maximised well\u0000below the Fermi surface in momentum space. By contrast, corresponding\u0000experiments on twelve fermions have found that pairing is maximal at the Fermi\u0000surface and strongly suppressed beneath [M. Holten et al., Nature 606, 287-291\u0000(2022)]. This suggests that the Fermi sea $-$ which acts to suppress pairing at\u0000low momenta through Pauli blocking $-$ emerges in the transition from six to\u0000twelve particles.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176121","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

Roadmap to vortex nucleation below critical rotation frequency in a dipolar Bose-Einstein condensate 双极玻色-爱因斯坦凝聚态中低于临界旋转频率的涡核路线图

arXiv - PHYS - Quantum Gases Pub Date : 2024-08-30 DOI: arxiv-2409.00251

Soumyadeep Halder, Hari Sadhan Ghosh, Arpana Saboo, Andy M. Martin, Sonjoy Majumder

{"title":"Roadmap to vortex nucleation below critical rotation frequency in a dipolar Bose-Einstein condensate","authors":"Soumyadeep Halder, Hari Sadhan Ghosh, Arpana Saboo, Andy M. Martin, Sonjoy Majumder","doi":"arxiv-2409.00251","DOIUrl":"https://doi.org/arxiv-2409.00251","url":null,"abstract":"The formation of quantized vortices in a superfluid above a certain critical\u0000trap rotation frequency serves as a hallmark signature of superfluidity. Based\u0000on the beyond mean field framework, crucial for the formation of exotic\u0000supersolid and droplet states, we investigate dynamic protocols for vortex\u0000nucleation in the superfluid and supersolid states of a dipolar Bose-Einstein\u0000condensate (BEC), at a significantly lower trap rotation frequency. We find\u0000that the critical rotation frequency of the trap varies with the dipole-dipole\u0000interaction strength and the polarization direction of the external magnetic\u0000field. Leveraging these characteristics of dipolar BECs, we demonstrate three\u0000dynamic protocols for vortex nucleation even when rotating below the critical\u0000rotation frequency viz.: (i) varying the $s$-wave scattering length, (ii)\u0000changing the polarizing angle, and (iii) successive modulation of both the\u0000scattering length and polarizing angle. These dynamic vortex seeding protocols\u0000could serve as important benchmarks for future experimental studies.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176128","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

Analog Hawking radiation from a spin-sonic horizon in a two-component Bose-Einstein condensate 来自双组分玻色-爱因斯坦凝聚体中自旋-声界的模拟霍金辐射

arXiv - PHYS - Quantum Gases Pub Date : 2024-08-30 DOI: arxiv-2408.17292

Anna Berti, Lennart Fernandes, Salvatore Giulio Butera, Alessio Recati, Michiel Wauters, Iacopo Carusotto

引用次数: 0

Anomalous Doppler effect in superfluid and supersolid atomic gases 超流体和超固体原子气体中的反常多普勒效应

arXiv - PHYS - Quantum Gases Pub Date : 2024-08-29 DOI: arxiv-2408.16489

Tomasz Zawiślak, Marija Šindik, Sandro Stringari, Alessio Recati

引用次数: 0

Topological superfluid phases of attractive Fermi-Hubbard model in narrow-band cold-atom optical lattices 窄带冷原子光晶格中具有吸引力的费米-哈伯德模型的拓扑超流体相

arXiv - PHYS - Quantum Gases Pub Date : 2024-08-29 DOI: arxiv-2408.16210

T. D. Stanescu, Sumanta Tewari, V. W. Scarola

{"title":"Topological superfluid phases of attractive Fermi-Hubbard model in narrow-band cold-atom optical lattices","authors":"T. D. Stanescu, Sumanta Tewari, V. W. Scarola","doi":"arxiv-2408.16210","DOIUrl":"https://doi.org/arxiv-2408.16210","url":null,"abstract":"We investigate the effects of attractive Hubbard interaction on two-component\u0000fermionic atoms in narrow two-dimensional (2D) energy bands that exhibit Rashba\u0000spin-orbit coupling (SOC) in the presence of an applied Zeeman field. This\u0000narrow-band 2D spin-orbit coupled attractive Fermi-Hubbard model can\u0000potentially be realized in cold atom systems in optical lattices with\u0000artificially engineered Rashba SOC and Zeeman field. Employing a\u0000self-consistent mean field approximation for the pairing potential, we uncover\u0000a complex phase diagram featuring various topological superfluid (TS) phases,\u0000dependent on the chemical potential and the Zeeman field. We focus on the\u0000pairing potential and the corresponding quasiparticle gap characterizing the TS\u0000phases, which are notably small for a wide-band model with quadratic dispersion\u0000near the $Gamma$-point, as found in earlier work, and we identify the\u0000parameter regimes that maximize the gap. We find that, while generally the\u0000value of the pairing potential increases with the reduction of the fermionic\u0000bandwidth, as expected for narrow- or flat-band systems, the magnitude of the\u0000topological gap characterizing the TS phases reaches a maximum of about\u0000$10-12.5%$ of the interaction strength at finite values of the hopping\u0000amplitude, Rashba coupling, and Zeeman field.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176123","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

Hartree-Fock approximation for non-Coulomb interactions in three and two-dimensional systems 三维和二维系统中非库仑相互作用的哈特里-福克近似值

arXiv - PHYS - Quantum Gases Pub Date : 2024-08-27 DOI: arxiv-2408.14967

Vlad-Mihai Ene, Ilinca Lianu, Ioan Grosu

引用次数: 0

Delta-Learning approach combined with the cluster Gutzwiller approximation for strongly correlated bosonic systems 强相关玻色子系统的德尔塔学习方法与集群古茨维勒近似相结合

arXiv - PHYS - Quantum Gases Pub Date : 2024-08-26 DOI: arxiv-2408.14306

Zhi Lin, Tong Wang, Sheng Yue

{"title":"Delta-Learning approach combined with the cluster Gutzwiller approximation for strongly correlated bosonic systems","authors":"Zhi Lin, Tong Wang, Sheng Yue","doi":"arxiv-2408.14306","DOIUrl":"https://doi.org/arxiv-2408.14306","url":null,"abstract":"The cluster Gutzwiller method is widely used to study the strongly correlated\u0000bosonic systems, owing to its ability to provide a more precise description of\u0000quantum fluctuations. However, its utility is limited by the exponential\u0000increase in computational complexity as the cluster size grows. To overcome\u0000this limitation, we propose an artificial intelligence-based method known as\u0000$Delta$-Learning. This approach constructs a predictive model by learning the\u0000discrepancies between lower-precision (small cluster sizes) and high-precision\u0000(large cluster sizes) implementations of the cluster Gutzwiller method,\u0000requiring only a small number of training samples. Using this predictive model,\u0000we can effectively forecast the outcomes of high-precision methods with high\u0000accuracy. Applied to various Bose-Hubbard models, the $Delta$-Learning method\u0000effectively predicts phase diagrams while significantly reducing the\u0000computational resources and time. Furthermore, we have compared the predictive\u0000accuracy of $Delta$-Learning with other direct learning methods and found that\u0000$Delta$-Learning exhibits superior performance in scenarios with limited\u0000training data. Therefore, when combined with the cluster Gutzwiller\u0000approximation, the $Delta$-Learning approach offers a computationally\u0000efficient and accurate method for studying phase transitions in large, complex\u0000bosonic systems.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176125","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

A symbiotic nondipolar droplet supersolid in a binary dipolar-nondipolar Dy-Rb mixture 二元双极-非双极 Dy-Rb 混合物中的共生非双极液滴超固体

arXiv - PHYS - Quantum Gases Pub Date : 2024-08-25 DOI: arxiv-2408.13924

S. K. Adhikari

{"title":"A symbiotic nondipolar droplet supersolid in a binary dipolar-nondipolar Dy-Rb mixture","authors":"S. K. Adhikari","doi":"arxiv-2408.13924","DOIUrl":"https://doi.org/arxiv-2408.13924","url":null,"abstract":"We demonstrate the formation of two types of symbiotic nondipolar droplet\u0000supersolid in a binary dipolar-nondipolar mixture with an interspecies\u0000atraction, where the dipolar (nondipolar) atoms are trapped (untrapped). In the\u0000absence of an interspecies attraction, in the first type, a dipolar droplet\u0000supersolid exists, whereas in the second type, there are no droplets in the\u0000dipolar component. To illustrate, we consider a $^{164}$Dy-$^{87}$Rb mixture,\u0000where the untrapped $^{87}$Rb supersolid sticks to the trapped $^{164}$Dy\u0000supersolid due to the interspecies attraction and forms a symbiotic supersolid\u0000with overlapping droplets. The first (second) type of symbiotic supersolid\u0000emerges for the scattering length $ a_1=85a_0$ ($a_1=95a_0$) of $^{164}$Dy\u0000atom, while under an appropriate trap a dipolar droplet supersolid exists (does\u0000not exist) for no interspecies interaction, where $a_0$ the Bohr radius. This\u0000study is based on the numerical solution of an improved binary mean-field\u0000model, where we introduce an intraspecies Lee-Huang-Yang interaction in the\u0000dipolar component, which stops a dipolar collapse and forms a dipolar\u0000supersolid.To observe this symbiotic droplet supersolid, one should prepare the\u0000corresponding fully trapped dipolar-nondipolar supersolid and then remove the\u0000trap on the nondipolar atoms.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176126","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

Stable 3D vortex solitons of high topological charge in a Rydberg-dressed Bose-Einstein condensate with spin-orbit coupling 具有自旋轨道耦合的雷德贝格压制玻色-爱因斯坦凝聚态中稳定的高拓扑电荷三维涡旋孤子

arXiv - PHYS - Quantum Gases Pub Date : 2024-08-23 DOI: arxiv-2408.12878

Yanchao Zhang, Chao Hang, Boris A. Malomed, Guoxiang Huang

{"title":"Stable 3D vortex solitons of high topological charge in a Rydberg-dressed Bose-Einstein condensate with spin-orbit coupling","authors":"Yanchao Zhang, Chao Hang, Boris A. Malomed, Guoxiang Huang","doi":"arxiv-2408.12878","DOIUrl":"https://doi.org/arxiv-2408.12878","url":null,"abstract":"Stable vortex solitons (VSs) are objects of great interest for fundamental\u0000studies and various applications, including particle trapping, microscopy, data\u0000encoding, and matter-wave gyroscopes. However, three-dimensional (3D) VSs with\u0000high topological charges, supported by self-attractive nonlinearities, are\u0000unstable against fragmentation, which eventually leads to internal blowup\u0000(supercritical collapse) of the fragments. Here, we propose a scheme for\u0000realizing stable 3D VSs with topological charges up to $5$ and $6$ in the two\u0000components of a binary, Rydberg-dressed Bose-Einstein condensate (BEC) with\u0000spin-orbit coupling (SOC). We show that, if the SOC strength exceeds a critical\u0000value, the rotational symmetry of the VSs in the transverse plane gets broken,\u0000resulting in separation of the two components. Nevertheless, the VSs with the\u0000broken symmetry remain stable. The VS stability domains are identified in the\u0000system's parameter space. Moreover, application of torque to the stable VSs\u0000sets them in the state of robust gyroscopic precession.","PeriodicalId":501521,"journal":{"name":"arXiv - PHYS - Quantum Gases","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176127","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