Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session K06: OutofEquilibrium Trapped GasesRecordings Available

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Chair: David Weld, UCSB Room: Salon 1/2 
Wednesday, June 1, 2022 10:30AM  10:42AM 
K06.00001: Phase diagram and dynamics of magnetic Bose polarons Simeon I Mistakidis, Georgios Koutentakis, Fabian Grusdt, Peter Schmelcher, Hossein R Sadeghpour We investigate the nonequilibrium dynamics of magnetic polarons by considering an impurity atom dressed by spinwave excitations in a onedimensional spinor Bose gas. The phase diagram which contains selfbound and repulsive magnetic polarons as well as phaseseparated regime is obtained as a function of Rabicoupling and spinspin interactions. A waveform of the magnetic polaron is extracted through an effective model. The residue is found to drop for strong impurityspin interactions towards the polaron catastrophe. We infer the dynamical persistence of the respective repulsive and attractive branches associated with the generation of strongly correlated spinwaves. Strikingly, a dynamical decay at early stages of the dynamics is observed for strong impuritymedium interactions followed by a diffusive polaron behavior. The impurity can be utilized to probe and manipulate spindemixing by suppressing ferromagnetic spinspin correlations. Controllable spindemixing and correlated magnetic polarons are experimentally realizable with current technologies. 
Wednesday, June 1, 2022 10:42AM  10:54AM 
K06.00002: Spontaneous Persistent Current Formation in a Fermionic Superfluid Ring Daniel G Allman, Parth Sabharwal, Kevin C Wright The KibbleZurek mechanism (KZM) is a paradigmatic prediction of universal critical dynamics as a system is quenched across a continuous phase transition. In narrow annular geometries, quenchinduced coarsening gives rise todefects which merge to form spontaneous supercurrents, whose winding numbers are predicted to scale universally with the quench time via the KZM. We report on the statistics of spontaneous persistent current formation in a ring of superfluid 6Li driven across its critical point. Namely, we measure scalings of postquench winding number cumulants over several orders of magnitude of quench times, and with varying amounts of initial angular momentum bias imparted to the normal fluid above the transition. We compare our findings with novel analytic predictions obtained from a linearized stochastic timedependent LandauGinzburg model. 
Wednesday, June 1, 2022 10:54AM  11:06AM 
K06.00003: The Generation of Turbulence within Shaken BoseEinstein Condensates Holly Alice Jess MiddletonSpencer, Luca Galantucci, Nick Parker, Carlo F Barenghi Following recent experimental studies, we model the generation of threedimensional quantum turbulence by shaking harmonically trapped atomic BoseEinstein condensates. We compare the experimentally observable quantities (e.g. twodimensional density images and density spectra) with the quantities which are either measured in related experiments with superfluid helium or are relevant in turbulence theory. We conclude that the quantum turbulence generated, a mixture of strong fragmented density fluctuations and small vortex loops, is unlike any other forms of quantum turbulence which has been theoretically investigated, thus posing a new challenge the theoretical understanding of quantum turbulence. 
Wednesday, June 1, 2022 11:06AM  11:18AM 
K06.00004: Oscillations of a BoseFermi mixture Alexander Chuang, Yiqi Ni, Eric Wolf, Zoe Yan, Carsten Robens, Martin W Zwierlein Mixtures of quantum fluids lie at the forefront of research into stronglycorrelated quantum matter. In our dualspecies ultracold atomic gas experiment, we study the dynamics of impurities interacting with a BEC bath. In equilibrium, impurities can form welldefined quasiparticles, Bose polarons, by interacting with the BEC [1]. We study their dynamics by inducing centerofmass oscillations in both species at varying impuritybath interaction strength. Our observations offer a promising starting point in the experimental study of the dynamics of BoseFermi mixtures in the impurity limit. 
Wednesday, June 1, 2022 11:18AM  11:30AM 
K06.00005: Compressible quantum turbulence with ultracold atoms. Michael M Forbes, Khalid Hossain, Piotr Magierski, Gabriel Wlazlowski, Saptarshi R Sarkar, Edward Eskew, Konrad Kobuszewski, Kazuyuki Sekizawa Ultracold atoms provide an experimental platform for studying compressible quantum turbulence with broad applications as quantum simulators of other systems including neutron stars. As first suggested by Feynman, quantized vortices play a key role in quantum turbulence, providing a microscopic mechanism for energy transfer across different scales. Theoretical descriptions of quantum turbulence tend to focus on properties of these vortices, but this description is complicated when the fluid is compressible as there are multiple ways to partition the energy between rotational and compressional flow. In this talk I will discuss some aspects of compressible quantum turbulence, and showcase results of largescale simulations including turbulence in rotating and nonrotating systems. 
Wednesday, June 1, 2022 11:30AM  11:42AM 
K06.00006: Sound Propagation in Degenerate ^{133}Cs^{6}Li BoseFermi Mixtures Geyue Cai, Krutik Patel, Chang Li, Cheng Chin We investigate sound propagation in BoseEinstein condensates of ^{133}Cs atoms immersed in degenerate Fermi gases of ^{6}Li atoms. Deep in quantum degeneracy, fermionic excitations near the Fermi surface mediate interactions between bosons, modifying the sound speed in the condensates. 
Wednesday, June 1, 2022 11:42AM  11:54AM 
K06.00007: Out of equilibrium superfluid density evolution of dipolar BoseEinstein condensate Rodrigo d Lima, Milan Radonjic, Axel Pelster We investigate theoretically the condensate depletion and the superfluid density evolution of an ultracold Bose gas in a time dependent weak random potential. The bosons are interacting both through an isotropic shortrange contact interaction and an anisotropic longrange dipoledipole interaction. The temporal evolution of the superfluid density and the condensate depletion is followed throughout switching on/off the random potential and compared with previous literature. We identify the equilibrium and the dynamical contributions to the two aforementioned quantities. A disorder switch on/off protocol is considered afterwards and it clarifies the role of the two respective contributions. 
Wednesday, June 1, 2022 11:54AM  12:06PM 
K06.00008: Generating Different Types of Quantum Turbulence. Saptarshi R Sarkar, Khalid Hossain, Andrea Barresi, Gabriel Wlazlowski, Piotr Magierski, Michael M Forbes Cold atomic systems provide a platform for studying quantum turbulence that can be used as a quantum simulator for macroscopic systems like neutron stars. In this talk, I will discuss how experiments can be designed by tuning parameters such as particle number, trapping geometry, and coupling strength, to generate different amounts and types of turbulence for both bosonic and fermionic superfluids across the BECBCS crossover. Although superfluids have no fundamental dissipation, these differences can be qualitatively explained, in terms of effective dissipation, after coarse graining. Control over the amount of generated turbulence is crucial for tuning experiments to model superfluids with large turbulent structures. 
Wednesday, June 1, 2022 12:06PM  12:18PM 
K06.00009: Probing scaleinvariant prethermal regime in systems quenched to criticality Yidan Wang, Susanne F Yelin, Ceren B Dag An experimentally feasible way to probe quantum phase transitions is through dynamical measurements where one quenches to the close vicinity of a quantum critical point (QCP). Upon quenching to a QCP, quantum manybody systems exhibit a prethermal temporal regime in onepoint observables. Here we present an analytical framework for the transverse field Ising chain (TFIC) that leads us to a scaleinvariant and universal scaling function of this critically prethermal regime both in edge and bulk observables. Our work provides a quantitative definition of critical slowing down of system observables, due to the quantum phase transition, in far from equilibrium setting. It further explains the robustness behind the nonequilibrium exponents that are numerically extracted for the spatially minimal and dynamical order parameters of TFIC. 
Wednesday, June 1, 2022 12:18PM  12:30PM 
K06.00010: Nonequilibrium metastability of the attractive onedimensional Bose gas Alvise Bastianello, Rebekka Koch, JeanSèbastien Caux Manybody quantum systems outofequilibrium host phases of matter that simply do not exist in equilibrium scenarios: the onedimensional Bose Gas (1dBG) with contact attractive interactions is an outstanding example of this dichotomy. The 1dBG is a ubiquitous effective description of many cold atoms experiments, where the presence of Feshbach resonances allows for a dynamical exploration of the whole interactions' range. On the theory side, a hallmark of the 1dBG is its integrability, which hinders thermalization and allows for analytical and exact insight. Within the attractive phase, the 1dBG forms bound states with arbitrary large negative binding energy, critically harming the stability of the gas at equilibrium. On the other hand, integrability prevents thermalization and enhances the stability of the gas. 
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