Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session M07: Synthetic Gauge Fields and Spin-orbit Coupling |
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Chair: Georg Raithel, University of Michigan Room: 206 B |
Wednesday, June 7, 2023 2:00PM - 2:12PM |
M07.00001: Chrial Edge States in a Rotating Quantum Gas Sungjae Chi, Ruixiao Yao, Airlia Shaffer, Martin W Zwierlein, Richard J Fletcher We report on the direct, in-situ observation of chiral edge states in a Bose-Einstein condensate subjected to a synthetic magnetic field created using rapid rotation. We demonstrate the use of an underlying scalar potential to smoothly control the momentum of the injected edge mode, and extract the variation in the resulting mode propagation speed. Finally, we explore the dependence of the edge mode speed and excitation energy on the wall sharpness, demonstrating a crossover from ExB behavior to that of an infinitely sharp wall. |
Wednesday, June 7, 2023 2:12PM - 2:24PM |
M07.00002: Confinement in doped Z2 lattice gauge theories Simon M Linsel, Lukas Homeier, Annabelle Bohrdt, Fabian Grusdt In proof-of-principle experiments, ultracold atoms have demonstrated that Z2 lattice gauge theories with dynamical matter can be studied in quantum simulators, and realistic proposals for large-scale realizations exist. Motivated by these developments, here we study the deconfinement of U(1) charges in such models, with a strong focus on observables directly accessible from snapshots generated by quantum simulators. We demonstrate that in the τx-basis the confined phase is characterized by localized hole pairs connected by (short) strings while deconfinement implies a global net of strings spanning over the entire lattice: We probe deconfinement with Monte Carlo simulations using percolation-inspired order parameters. |
Wednesday, June 7, 2023 2:24PM - 2:36PM |
M07.00003: Dynamics of cold gas in synthetic non-Abelian gauge fields in free space Chetan Sriram Madasu, Mehedi Hasan, ketan D rathod, Chang Chi C Kwong, Thomas Zanon-Willette, Christian Miniatura, Frédéric Chevy, david wilkowski We report on experimental results of studies of dynamics of a cold gas subjected to synthetic non-Abelian gauge fields. In sharp contrast with the Abelian case, spatially uniform non-Abelian gauge fields can induce particle non-inertial motion. We explore this intriguing phenomenon with a degenerate Fermi gas subjected to a two-dimensional synthetic SU(2) and SU(3) non-Abelian gauge fields in free space. We demonstrate the spin-Hall characteristics of the dynamics as well as its anisotropy in amplitude and frequency due to the spin texture of our SU(2) system. We draw the similarities and differences of the observed wave packet dynamics and the well-known Zitterbewegung effect. As opposed to SU(2) systems with two ladder operators viz., raising and lowering operators, SU(3) systems have additional ladder operators due to eight generators of the symmetry. We demonstrate the existence of additional ladder operators in our SU(3) system by performing two kinds of Π-pulses between the basis states. |
Wednesday, June 7, 2023 2:36PM - 2:48PM |
M07.00004: Anisotropic superfluidity in the stripe phase found in spin-orbit coupled Bose-Einstein condensates Ethan C McGarrigle, Kris T Delaney, Leon Balents, Glenn H Fredrickson Spin-orbit coupled Bose-Einstein condensates host unconventional superfluid phases in bulk, such as a stripe phase with smectic character. Despite much progress in the mean-field and zero temperature limits, the precise superfluid character of the stripe phase is poorly understood at finite temperature. To investigate and quantify finite temperature effects, this work numerically samples a (2 + 1)-dimensional coherent state statistical field theory via the Complex Langevin algorithm, capturing T>0 thermodynamics without approximation. Employing the phase twist method, the superfluid density tensor is calculated and studied as a function of temperature, spin-orbit coupling anisotropy, and spin-orbit coupling strength. Low but finite temperature results suggest a significant reduction in superfluidity in the direction parallel to the stripes in the limit of isotropic spin-orbit coupling. |
Wednesday, June 7, 2023 2:48PM - 3:00PM |
M07.00005: Momentum space Josephson oscillations in a spin-orbit coupled Bose-Einstein condensate Annesh Mukhopadhyay, Md Kamrul Hoque Ome, Sean Mossman, Xi-Wang Luo, Chuanwei Zhang, Peter W Engels Josephson oscillations are a key quantum phenomenon with broad applications from sensing to quantum information. While the effect has first been discovered in tunneling supercurrents, the realization of Josephson oscillations in dilute gas Bose-Einstein condensate has opened up new paths for experimental investigations. |
Wednesday, June 7, 2023 3:00PM - 3:12PM |
M07.00006: From composite particles to lattice gauge theories in systems of Rydberg Atoms with density-dependent Peierls Phases Simon Ohler, Michael Fleischhauer We show that the nonlinear transport of bosonic excitations in a two-dimensional honeycomb lattice of spin-orbit coupled Rydberg atoms gives rise to vacancies that carry flux quanta reminiscent of composite particles found in fractional quantum Hall systems. Experiments have recently shown [Lienhard et al., Phys. Rev. X, 10, 021031 (2020)] that spin-orbit coupling in Rydberg systems breaks time-reversal and chiral symmetries and leads to a tunable density-dependent complex hopping of the hard-core bosonic excitations or equivalently to complex XY spin interactions. We numerically investigate the time evolution of such a system at different fillings and find that vacancies on one sublattice act as local magnetic impurities to excitations on the other sublattice. We also consider the chiral (edge) motion of the magnetic impurities and the emergence of an Abrikosov-type vortex lattice. Lastly, we discuss the implications for possible anyonic quasiparticles in the system and applications to simple lattice gauge theories. |
Wednesday, June 7, 2023 3:12PM - 3:24PM |
M07.00007: Growing Extended Laughlin States in a Quantum Gas Microscope Felix A Palm, Nathan Goldman, Fabian Grusdt The study of fractional Chern insulators and their exotic anyonic excitations poses a major challenge in current experimental and theoretical research. Quantum simulators, in particular ultracold atoms in optical lattices, provide a promising platform to realize, manipulate, and understand such systems with a high degree of controllability. Recently, an atomic ν=½-Laughlin state has been realized experimentally for a small system of two particles on 4×4 sites [Leonard et al., arXiv:2210.10919]. |
Wednesday, June 7, 2023 3:24PM - 3:36PM |
M07.00008: Bose-Einstein Condensate Gyroscope via a Synthetic Magnetic Field Chunlei Qu, Chuan-Hsun Li, Yong P Chen, Sandro Stringari The realization of synthetic magnetic fields in a spin-orbit-coupled Bose-Einstein condensate has enabled the observation of vortices and the exploration of topological physics with ultracold atomic gases. In this talk, I will present our recent work on the quadrupole modes of a Bose-Einstein condensate in the presence of a synthetic magnetic field. We find that the scissors mode excited in the horizontal plane perpendicular to the direction of the synthetic magnetic field causes an oscillation in the widths of the condensate. More remarkable, the two scissors modes in the vertical planes are also coupled by the synthetic magnetic field, giving rise to interesting gyroscope dynamics. The coupling of these quadrupole modes exhibits different behaviors after vortices appear due to a further increase of the synthetic magnetic field. |
Wednesday, June 7, 2023 3:36PM - 3:48PM |
M07.00009: Quantum Dynamics of a Fermionic Tilted Flux Ladder Tianrui Xu, Ana Maria Rey, Anjun Chu We theoretically study the quantum dynamics of fermions in a tilted flux ladder. A flux ladder without any tilt is known to have a Meissner-vortex phase transition that resembles type-II superconductors. Here we show such picture is drastically modified in the presence of a tilting potential. In our system, the chiral currents exhibit signatures of a dynamical phase transition from dimerized oscillatory behaviors to Stark localization. Under specific conditions, our system also features a Dirac-type dispersion, which is modified in the presence of interactions. Our prediction can be realized and tested experimentally in a Wannier-Stark optical lattice clock with spin-orbit coupling. |
Wednesday, June 7, 2023 3:48PM - 4:00PM Withdrawn |
M07.00010: Raman momentum lattice with ultracold atoms Bo Yan We developed internal and external states combined momentum lattice by implementing both Bragg and Raman couplings with ultracold atoms. Such Raman momentum lattice provides additional engineering knobs. By introducing loss in one internal state, we realize a dissipative Aharonov-Bohm chain—non-Hermitian topological model with NHSE. We identify signatures of the NHSE in the condensate dynamics and perform Bragg spectroscopy to resolve topological edge states against a background of localized bulk states. With two internal states, we also realize the AB cage model, and the flat band localization is observed. By introducing disorders to the AB cage system, a transition from flat band localization to Anderson localized is observed. Our Raman momentum lattice has good potential for further quantum-simulating novel physics. |
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