Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N66: Quantum Gases IFocus
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Sponsoring Units: DAMOP Chair: Xinghai Zhang, Rice University Room: Room 413 |
Wednesday, March 8, 2023 11:30AM - 12:06PM |
N66.00001: Generalized hydrodynamics in strongly interacting 1D Bose gases Invited Speaker: Marcos Rigol
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Wednesday, March 8, 2023 12:06PM - 12:18PM |
N66.00002: Incorporating the retardation effect in cavity-mediated superconductivity of cold atoms Masoud Mohammadi-Arzanagh, Andrey Grankin, Mohammad Hafezi, Victor M Galitski Transitioning to superconductivity has been observed in metals, and many aspects of it has been explored so far. A similar transitioning can occur in a system of fermions coupled to cavity modes where photons mediate an attraction between the trapped fermions. Therefore, fermions can pair up and condensate at sufficiently low temperatures. Given the magnitude of the coupling between atoms, we can also determine the transitioning temperature from the normal state to anomalous states, for which the order parameter of our system takes a non-vanishing value. |
Wednesday, March 8, 2023 12:18PM - 12:30PM |
N66.00003: General theory of flat-band ferromagnetism in the SU(n) Hubbard model Kensuke Tamura The SU(n) Hubbard model, which describes multi-component fermions with SU(n) symmetric interaction, has attracted much attention recently because of its realization in cold-atom setups [1]. However, its analytical treatment is, in general, hard, and there are few rigorous results established for n>2. An example of a rigorous result that is already known for the SU(n) Hubbard model is flat-band ferromagnetism. In the SU(2) case, a general theory of flat-band ferromagnetism has been established for a general class of models with the lowest flat band [2, 3]. On the other hand, in the SU(n) case of an arbitrary integer n>2, only a specific class of flat-band ferromagnetism has been discussed, and no general theory has been presented. |
Wednesday, March 8, 2023 12:30PM - 12:42PM |
N66.00004: The fate of Fulde-Ferrell-Larkin-Ovchinnikov order in spin-orbit coupled cold atomic Fermi systems Dhan Bautista, Ettore Vitali, Peter Rosenberg, Shiwei Zhang This work will build on the recent non-perturbative results in Phys. Rev. Lett. 128, 203201 |
Wednesday, March 8, 2023 12:42PM - 12:54PM |
N66.00005: Statistically Suppressed Coherence in the Anyon-Hubbard Dimer Martin Bonkhoff, Axel Pelster, Imke Schneider, Sebastian Eggert The impact of statistical transmutation on superfluid tendencies is investigated for the Anyon-Hubbard dimer, a two-site restriction of the lattice generalization of Kundu anyons [1], experimentally accessible via the creation of density-dependent gauge phases and additional strong confinement [2]. We find a duality relation between the anyonic and the Bose-Hubbard dimer, which allows us to construct the corresponding, exact, algebraic Bethe-Ansatz solution. For large particle numbers and weak on-site interactions, the coherence properties are found to be strongly suppressed by statistical transmutation, with underlying mechanisms and applications analogous to one-axis spin-squeezing and entangled coherent states in quantum optics [3,4].
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Wednesday, March 8, 2023 12:54PM - 1:06PM Author not Attending |
N66.00006: Dimensional crossover in self-organised super-radiant lattice supersolid phases of ultra cold atoms inside a cavity Sankalpa Ghosh We consider a condensate of ultra cold bosonic atoms in a linear optical cavity illuminated by a two-pump configuration where each pump is making different angles with the direction of the cavity axis. We show such configuration allows a smooth transition from a one-dimensional quantum optical lattice configuration to a two-dimensional quantum optical lattice configuration induced by the cavity-atom interaction. Using a Holstein-Primakoff transformation, we find out the atomic density profile of such self-organised ground state in the super-radiant phase as a function of the angular orientations of the pump in such dynamical quantum optical lattice . We also compare our results with the one calculated using Extended Bose-Hubbard model in such quantum optical lattice potential. |
Wednesday, March 8, 2023 1:06PM - 1:18PM |
N66.00007: Phase diagrams of dipolar lattice bosons trapped in a cavity yaghmorassene hebib, Chao Zhang, Barbara Capogrosso-Sansone, Jin Yang By means of quantum Monte Carlo, we study bosons trapped in a square optical lattice and interacting via dipolar and cavity-mediated interactions. The system is described by the Bose-Hubbard model in the presence of dipolar and infinite-range interactions. On the one hand, we investigate how the presence of cavity-mediated interaction modifies the ground-state phase diagram of lattice dipolar bosons. On the other hand, we study how the presence of dipolar interaction modifies the ground-state phase diagram of lattice bosons in a cavity. We conclude with a discussion on experimental realization and observability of the phases stabilized by the model. |
Wednesday, March 8, 2023 1:18PM - 1:30PM |
N66.00008: Singlet-RVB Solid Phase of SU(4) Fermi Gas with Population Imbalance in a Tetramerized Optical Lattice Yuki Miyazaki, Daisuke Yamamoto, Giacomo Marmorini, Nobuo Furukawa In the area of cold atomic systems, recently a great deal of effort is being made to realize higher-symmetric quantum many-body systems and find novel physical properties. Alkaline-earth(-like) fermionic atoms have nuclear spin I, e.g., I = 5/2 for 173Yb, and with these atomic species we can prepare ideal SU(N ≤ 2I + 1)-symmetric systems [1, 2]. In this work, we study the quantum magnetism of the SU(4) Mott insulator in a tetramerized optical lattice, in which atoms with four nuclear-spin components strongly interact with each other. We investigate quantum phases induced by the external field that favors the populations of two components against the other two. This is a natural extension of the physics of spin-dimer materials such as TlCuCl3 [3, 4] under strong magnetic field to SU(4)-symmetric systems. We study the ground state of the Hamiltonian using an extended linear flavor-wave theory [5] based on four-site plaquettes. We unveil the ground-state phase diagram in the plane of external field vs. interplaquette exchange coupling. Our main finding is a nontrivial quantum phase, which has a checkerboard-like arrangement of the SU(4) singlet and four-site RVB states [6, 7]. |
Wednesday, March 8, 2023 1:30PM - 1:42PM |
N66.00009: Ferromagnetic ground states of doped Hubbard models in optical lattices Rhine Samajdar, R. N Bhatt The search for ferromagnetism in the Hubbard model has been a problem of outstanding interest since Nagaoka’s original proposal in 1966. Recent advances in quantum simulation have today enabled the study of tunable doped Hubbard models in ultracold atomic systems. Here, we study a variant of such a model wherein any second electron on a single lattice site is weakly bound compared to the first1. Employing large-scale density-matrix renormalization group and exact diagonalization calculations, we establish the existence of high-spin ground states on the nanoscale, analyze their finite-temperature signatures, and investigate the competition between ferromagnetic and stripe orders. We also discuss the experimental realization of this system in current-generation optical lattice platforms via the careful use of Feshbach resonances. |
Wednesday, March 8, 2023 1:42PM - 1:54PM |
N66.00010: Universality in quantum liquids and the Lattice Field Theory problem Manuel Valiente Quantum gases with short-range interactions at ultralow temperature are usually ”universal”, in the |
Wednesday, March 8, 2023 1:54PM - 2:06PM |
N66.00011: Fulde-Ferrell-Larkin-Ovchinnikov Phase and Beyond in the Ground State of Spin-Polarized Cold Atoms in Optical Lattices Ettore Vitali, Peter Rosenberg, Shiwei Zhang We study the ground state of spin-polarized cold atoms in a two-dimensional optical lattice in the bulk limit by interfacing state-of-the-art Hartree-Fock-Bogoliubov calculations with cutting-edge correlated Quantum Monte Carlo techniques. Leveraging recent methodological advances, we are able to systematically study large lattice sizes, hosting nearly 500 atoms, which allows us to minimize finite-size effects and to provide robust results in the thermodynamic limit. We focus on the high density and small spin polarization regime, which is believed to be most favorable to the emergence of the elusive Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluid phase. We find clear evidence of FFLO order, which appears to be part of an intricate coexistence of long-range orders, significantly different from the standard mean-field description. We also explore the effects of introducing spin-orbit coupling, which opens the possibility to observe topological superfluids, with fascinating connection with Majorana fermions. |
Wednesday, March 8, 2023 2:06PM - 2:18PM |
N66.00012: Entanglement entropy and spectrum across superfluid-insulator transitions with different symmetry breaking Atsushi Kakizawa, Daisuke Yamamoto, Nobuo Furukawa We study the entanglement properties across superfluid-Mott insulator transitions with different types of symmetry breaking. In a previous work [1] about the paradigmatic Bose- Hubbard model on a square lattice, the value of entanglement entropy (EE) at the U(1) transition point at integer filling, where Goldstone and Higgs modes become gapless, is the highest in the phase diagram. In order to expand the discussion of the relationship between EE and symmetry breaking, we consider the Bose-Hubbard model in which the sign of the nearest-neighbor hopping J is inverted on a triangular lattice. In this model, frustration induces a 120-degree phase structure in the superfluid phase, which breaks Z2 chirality symmetry, in addition to U(1). We also consider the case of anisotropic triangular lattice with frustrated hoppings J, J’. By changing the ratio J’/J we can interpolate between various interesting limits (1D chain, triangular lattice, square lattice) and investigate the properties of EE and entanglement spectrum(ES), including the singular points between different lattice shapes. In this presentation, we discuss superfluid-Mott insulator transition in different types of symmetry breaking from the perspectives of EE and ES. |
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