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Ground state of the polaron in an ultracold dipolar Fermi gas 极化子在超冷偶极费米气体中的基态
arXiv: Quantum Gases Pub Date : 2020-10-29 DOI: 10.1103/PHYSREVA.103.033324
Kazuya Nishimura, E. Nakano, K. Iida, H. Tajima, T. Miyakawa, H. Yabu
{"title":"Ground state of the polaron in an ultracold dipolar Fermi gas","authors":"Kazuya Nishimura, E. Nakano, K. Iida, H. Tajima, T. Miyakawa, H. Yabu","doi":"10.1103/PHYSREVA.103.033324","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.033324","url":null,"abstract":"An impurity atom immersed in an ultracold atomic Fermi gas can form a quasiparticle, so-called Fermi polaron, due to impurity-fermion interaction. We consider a three-dimensional homogeneous dipolar Fermi gas as a medium, where the interatomic dipole-dipole interaction (DDI) makes the Fermi surface deformed into a spheroidal shape, and, using a Chevy-type variational method, investigate the ground-state properties of the Fermi polaron: the effective mass, the momentum distribution of a particle-hole (p-h) excitation, the drag parameter, and the medium density modification around the impurity. These quantities are shown to exhibit spatial anisotropies in such a way as to reflect the momentum anisotropy of the background dipolar Fermi gas. We have also given numerical results for the polaron properties at the unitarity limit of the impurity-fermion interaction in the case in which the impurity and fermion masses are equal. It has been found that the transverse effective mass and the transverse momentum drag parameter of the polaron both tend to decrease by $ sim 10%$ when the DDI strength is raised from $0$ up to around its critical value, while the longitudinal ones exhibit a very weak dependence on the DDI.","PeriodicalId":8838,"journal":{"name":"arXiv: Quantum Gases","volume":"93 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79918417","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: 3
Collisionless sound of bosonic superfluids in lower dimensions 低维玻色子超流体的无碰撞声
arXiv: Quantum Gases Pub Date : 2020-10-29 DOI: 10.1103/PHYSREVA.103.043324
L. Salasnich, F. Sattin
{"title":"Collisionless sound of bosonic superfluids in lower dimensions","authors":"L. Salasnich, F. Sattin","doi":"10.1103/PHYSREVA.103.043324","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.043324","url":null,"abstract":"The superfluidity of low-temperature bosons is well established in the collisional regime. In the collisionless regime, however, the presence of superfluidity is not yet fully clarified, in particular in lower spatial dimensions. Here we compare the Vlasov-Landau equation, which does not take into account the superfluid nature of the bosonic system, with the Andreev-Khalatnikov equations, which instead explicitly contain a superfluid velocity. We show that recent experimental data of the sound mode in a two-dimensional collisionless Bose gas of $^{87}$Rb atoms are in good agreement with both theories but the sound damping is better reproduced by the Andreev-Khalatnikov equations below the Berezinskii-Kosterlitz-Thouless critical temperature $T_c$ while above $T_c$ the comparison is not conclusive. For one dimensional bosonic fluids, where experimental data are not yet available, we find larger differences between the sound velocities predicted by the two transport theories and, also in this case, the existence of a superfluid velocity reduces the sound damping.","PeriodicalId":8838,"journal":{"name":"arXiv: Quantum Gases","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87467915","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: 2
Dynamics of massive point vortices in a binary mixture of Bose-Einstein condensates 玻色-爱因斯坦凝聚二元混合物中大质量点涡的动力学
arXiv: Quantum Gases Pub Date : 2020-10-26 DOI: 10.1103/PHYSREVA.103.023311
A. Richaud, V. Penna, A. Fetter
{"title":"Dynamics of massive point vortices in a binary mixture of Bose-Einstein condensates","authors":"A. Richaud, V. Penna, A. Fetter","doi":"10.1103/PHYSREVA.103.023311","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.023311","url":null,"abstract":"We study the massive point-vortex model introduced in Ref. [Phys. Rev. A 101, 013630 (2020)], which describes two-dimensional point vortices of one species that have small cores of a different species. We derive the relevant Lagrangian itself, based on the time-dependent variational method with a two-component Gross-Pitiavskii (GP) trial function. The resulting Lagrangian resembles that of charged particles in a static electromagnetic field, where the canonical momentum includes an electromagnetic term. The simplest example is a single vortex with a rigid circular boundary, where a massless vortex can only precess uniformly. In contrast, the presence of a sufficiently large filled vortex core renders such precession unstable. A small core mass can also lead to small radial oscillations, which are, in turn, clear evidence of the associated inertial effect. Detailed numerical analysis of coupled two-component GP equations with a single vortex and small second-component core confirms the presence of such radial oscillations, implying that this more realistic GP vortex also acts as if it has a small massive core.","PeriodicalId":8838,"journal":{"name":"arXiv: Quantum Gases","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75299931","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: 18
Modeling Rydberg gases using random sequential adsorption on random graphs 在随机图上用随机顺序吸附法模拟里德堡气体
arXiv: Quantum Gases Pub Date : 2020-10-26 DOI: 10.1103/PHYSREVA.103.033302
Daan Rutten, J. Sanders
{"title":"Modeling Rydberg gases using random sequential adsorption on random graphs","authors":"Daan Rutten, J. Sanders","doi":"10.1103/PHYSREVA.103.033302","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.033302","url":null,"abstract":"The statistics of strongly interacting, ultracold Rydberg gases are governed by the interplay of two factors: geometrical restrictions induced by blockade effects, and quantum mechanical effects. To shed light on their relative roles in the statistics of Rydberg gases, we compare three models in this paper: a quantum mechanical model describing the excitation dynamics within a Rydberg gas, a Random Sequential Adsorption (RSA) process on a Random Geometric Graph (RGG), and a RSA process on a Decomposed Random Intersection Graph (DRIG). The latter model is new, and refers to choosing a particular subgraph of a mixture of two other random graphs. Contrary to the former two models, it lends itself for a rigorous mathematical analysis; and it is built specifically to have particular structural properties of a RGG. We establish for it a fluid limit describing the time-evolution of number of Rydberg atoms, and show numerically that the expression remains accurate across a wider range of particle densities than an earlier approach based on an RSA process on an Erdos-Renyi Random Graph (ERRG). Finally, we also come up with a new heuristic using random graphs that gives a recursion to describe a normalized pair-correlation function of a Rydberg gas. Our results suggest that even without dissipation, on long time scales the statistics are affected most by the geometrical restrictions induced by blockade effects, while on short time scales the statistics are affected most by quantum mechanical effects.","PeriodicalId":8838,"journal":{"name":"arXiv: Quantum Gases","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81893150","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
Criticality-enhanced quantum sensing in ferromagnetic Bose-Einstein condensates: Role of readout measurement and detection noise 铁磁玻色-爱因斯坦凝聚体中的临界增强量子传感:读出测量和检测噪声的作用
arXiv: Quantum Gases Pub Date : 2020-10-25 DOI: 10.1103/PHYSREVA.103.023317
Safoura S. Mirkhalaf, D. Benedicto Orenes, M. Mitchell, E. Witkowska
{"title":"Criticality-enhanced quantum sensing in ferromagnetic Bose-Einstein condensates: Role of readout measurement and detection noise","authors":"Safoura S. Mirkhalaf, D. Benedicto Orenes, M. Mitchell, E. Witkowska","doi":"10.1103/PHYSREVA.103.023317","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.023317","url":null,"abstract":"We theoretically investigate estimation of the control parameter in a ferromagnetic Bose-Einstein condensate near second order quantum phase transitions. We quantify sensitivity by quantum and classical Fisher information and using the error-propagation formula. For these different metrics, we find the same, beyond-standard-quantum-limit (SQL) scaling with atom number near critical points, and SQL scaling away from critical points. We find that both depletion of the $m_f=0$ Zeeman sub-level and transverse magnetization provide signals of sufficient quality to saturate the sensitivity scaling. To explore the effect of experimental imperfections, we study the scaling around criticality at nonzero temperature and with nonzero detection noise. Our results suggest the feasibility of sub-SQL sensing in ferromagnetic condensates with current experimental capabilities.","PeriodicalId":8838,"journal":{"name":"arXiv: Quantum Gases","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83141404","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: 12
Taming the snake instabilities in a polariton superfluid 驯服极化子超流体中的蛇形不稳定性
arXiv: Quantum Gases Pub Date : 2020-10-25 DOI: 10.1364/optica.405946
F. Claude, S. Koniakhin, A. Maître, S. Pigeon, G. Lerario, D. D. Stupin, Q. Glorieux, E. Giacobino, D. Solnyshkov, G. Malpuech, A. Bramati
{"title":"Taming the snake instabilities in a polariton superfluid","authors":"F. Claude, S. Koniakhin, A. Maître, S. Pigeon, G. Lerario, D. D. Stupin, Q. Glorieux, E. Giacobino, D. Solnyshkov, G. Malpuech, A. Bramati","doi":"10.1364/optica.405946","DOIUrl":"https://doi.org/10.1364/optica.405946","url":null,"abstract":"The dark solitons observed in a large variety of nonlinear media are unstable against the modulational (snake) instabilities and can break in vortex streets. This behavior has been investigated in nonlinear optical crystals and ultracold atomic gases. However, a deep characterization of this phenomenon is still missing. In a resonantly pumped 2D polariton superfluid, we use an all-optical imprinting technique together with the bistability of the polariton system to create dark solitons in confined channels. Due to the snake instabilities, the solitons are unstable and break in arrays of vortex streets whose dynamical evolution is frozen by the pump-induced confining potential, allowing their direct observation in our system. A deep quantitative study shows that the vortex street period is proportional to the quantum fluid healing length, in agreement with the theoretical predictions. Finally, the full control achieved on the soliton patterns is exploited to give a proof of principle of an efficient, ultra-fast, analog, all-optical maze solving machine in this photonic platform.","PeriodicalId":8838,"journal":{"name":"arXiv: Quantum Gases","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89793697","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: 9
Damped point-vortex model for polar-core spin vortices in a ferromagnetic spin-1 Bose-Einstein condensate 铁磁自旋-1玻色-爱因斯坦凝聚体中极核自旋涡的阻尼点涡模型
arXiv: Quantum Gases Pub Date : 2020-10-23 DOI: 10.1103/PHYSREVRESEARCH.3.013154
L. Williamson, P. B. Blakie
{"title":"Damped point-vortex model for polar-core spin vortices in a ferromagnetic spin-1 Bose-Einstein condensate","authors":"L. Williamson, P. B. Blakie","doi":"10.1103/PHYSREVRESEARCH.3.013154","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013154","url":null,"abstract":"Ferromagnetic spin-1 Bose-Einstein condensates in the broken-axisymmetric phase support polar-core spin vortices (PCVs), which are intimately linked to the nonequilibrium dynamics of the system. For a purely transversely magnetized system, the Turner point-vortex model predicts that PCVs behave like massive charged particles interacting via a two-dimensional Coulomb potential. We test the accuracy of the Turner model for two oppositely charged PCVs, via comparisons with numerical simulations. While the bare Turner model shows discrepancies with our numerical results, we find that a simple rescaling of the PCV mass gives much better agreement. This can be explained via a phenomenological damping arising from coupling to modes extrinsic to the point-vortex phase space. We also identify the excitations produced following PCV annihilation, which help elucidate recent phase ordering results. We extend the Turner model to cases where the system is magnetized both transversally and axially, identifying a crossover to scalar vortex dynamics for increasing external Zeeman field.","PeriodicalId":8838,"journal":{"name":"arXiv: Quantum Gases","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75617734","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: 3
Multimode N00N states in driven atomtronic circuits 驱动原子电路中的多模N00N态
arXiv: Quantum Gases Pub Date : 2020-10-22 DOI: 10.1103/physrevresearch.2.043118
E. Compagno, Guillaume Quesnel, A. Minguzzi, L. Amico, D. Feinberg
{"title":"Multimode N00N states in driven atomtronic circuits","authors":"E. Compagno, Guillaume Quesnel, A. Minguzzi, L. Amico, D. Feinberg","doi":"10.1103/physrevresearch.2.043118","DOIUrl":"https://doi.org/10.1103/physrevresearch.2.043118","url":null,"abstract":"We propose a method to generate multi-mode N00N states with arrays of ultracold atoms. Our protocol requires a strong relative offset among the wells and a drive of the interparticle interaction at a frequency resonant with the offsets. The proposal is demonstrated by a numerical and a Floquet analysis of the quantum dynamics of a ring-shaped atomtronics circuit made of M weakly coupled optical traps. We generate a hierarchy of energy scales down to very few low-energy states where N00N dynamics takes place, making multi-mode N00N states appear at nearly regular time intervals. The production of multi-mode N00N states can be probed by time-of-flight imaging. Such states may be used to build a multiple beam splitter.","PeriodicalId":8838,"journal":{"name":"arXiv: Quantum Gases","volume":"141 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76190193","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: 3
Symmetry breaking and phase transitions in Bose-Einstein condensates with spin–orbital-angular-momentum coupling 具有自旋-轨道-角动量耦合的玻色-爱因斯坦凝聚体的对称性破缺和相变
arXiv: Quantum Gases Pub Date : 2020-10-21 DOI: 10.1103/physreva.102.063328
Y. Duan, Yuriy Bidasyuk, A. Surzhykov
{"title":"Symmetry breaking and phase transitions in Bose-Einstein condensates with spin–orbital-angular-momentum coupling","authors":"Y. Duan, Yuriy Bidasyuk, A. Surzhykov","doi":"10.1103/physreva.102.063328","DOIUrl":"https://doi.org/10.1103/physreva.102.063328","url":null,"abstract":"Theoretical study is presented for a spinor Bose-Einstein condensate, whose two components are coupled by copropagating Raman beams with different orbital angular momenta. The investigation is focused on the behavior of the ground state of this condensate, depending on the atom-light coupling strength. By analyzing the ground state, we have identified a number of quantum phases, which reflect the symmetries of the effective Hamiltonian and are characterized by the specific structure of the wave function. In addition to the well-known stripe, polarized and zero-momentum phases, our results show that the system can support phases, whose wave function contains a complex vortex molecule. Such molecule plays an important role in the continuous phase transitions of the system. The predicted behavior of vortex-molecule phases can be examined in cold-atom experiments using currently existing techniques.","PeriodicalId":8838,"journal":{"name":"arXiv: Quantum Gases","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86800702","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: 4
Droplet under confinement: Competition and coexistence with a soliton bound state 约束下的液滴:与孤子束缚态的竞争与共存
arXiv: Quantum Gases Pub Date : 2020-10-21 DOI: 10.1103/PHYSREVRESEARCH.3.L012027
Xiaoling Cui, Yin-feng Ma
{"title":"Droplet under confinement: Competition and coexistence with a soliton bound state","authors":"Xiaoling Cui, Yin-feng Ma","doi":"10.1103/PHYSREVRESEARCH.3.L012027","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.L012027","url":null,"abstract":"We study the stability of quantum droplet and its associated phase transitions in ultracold Bose-Bose mixtures uniformly confined in quasi-two-dimension. We show that the confinement-induced boundary effect can be significant when increasing the atom number or reducing the confinement length, which destabilizes the quantum droplet towards the formation of a soliton bound state. In particular, as increasing the atom number we find the reentrance of soliton ground state, while the droplet is stabilized only within a finite number window that sensitively depends on the confinement length. Near the droplet-soliton transitions, they can coexist with each other as two local minima in the energy landscape. Take the two-species $^{39}$K bosons for instance, we have mapped out the phase diagram for droplet-soliton transition and coexistence in terms of atom number and confinement length. The revealed intriguing competition between quantum droplet and soliton under confinement can be readily probed in current cold atoms experiments.","PeriodicalId":8838,"journal":{"name":"arXiv: Quantum Gases","volume":"84 3 Suppl 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83640570","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: 7
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