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 Q08: Dynamics of Cold Atoms in Optical Lattices |
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Chair: Dominik Schneble, Stony Brook Room: 206 C |
Thursday, June 8, 2023 8:00AM - 8:12AM |
Q08.00001: Quantum Simulation of Dynamics in the 1D Anyon Hubbard Model Perrin C Segura, Joyce Kwan, Yanfei Li, Sooshin Kim, Brice Bakkali-Hassani, Markus Greiner We present an experimental realization of the 1D Anyon Hubbard Model (AHM), where we use two-particle quantum walks to explore dynamics with a tunable, arbitrary statistical phase. Through a generalized Jordan-Wigner transformation, the AHM can be represented as a bosonic Hubbard model with a density-dependent tunneling phase. Using Rubidium-87 atoms in an optical lattice, we engineer this dynamical gauge field via three-tone lattice amplitude modulation. This Floquet method provides independent control of the statistical phase, tunneling amplitude, and interaction energy. |
Thursday, June 8, 2023 8:12AM - 8:24AM Withdrawn |
Q08.00002: Time-resolved measurements of the anomalous Hall velocity Alexander Ilin, Klaus Sengstock, Juliette Simonet The anomalous velocity is a purely intrinsic interference effect that gives rise to many fascinating transport phenomena in solids, including the anomalous Hall effect (AHE), the spin Hall effect (SHE), and their quantized versions. However, measuring the anomalous velocity in real solid-state materials is challenging as a direct observation of electron wave-packet dynamics is generally impeded by inherent short times for scattering. |
Thursday, June 8, 2023 8:24AM - 8:36AM |
Q08.00003: The dynamics of Li-6 fermions in a 1D optical shaken lattice Feng Xiong, Kaiyue Wang, Colin V Parker An optical lattice serves as a great platform for quantum simulation, including in dynamical situations using the Floquet model. Using a shaken lattice, the dispersion relation of single particles can be tuned. We implemented a 1D optical lattice to our all-optical dipole trap for molelcular Bose condensates of Li-6 pairs. The driving signal is modulated through an IQ modulator fed to two AOMs, which shakes the lattice. By loading a molecular BEC into the shaking lattice, we have achieved coupling between the first two energy bands resulting in a double-well dispersion. In this talk, I will report our observations of the atomic cloud bifurcated into two soliton-like peaks traveling in the quasimomentum space. We also installed a high-resolution absorption imaging system, with resolution up to two microns. By taking the in-situ data of the BEC in the shaken lattice, a density corrugation is observed in the atom cloud, which is caused by the two bifurcated wave peaks with opposing momentum beginning to separate. We interpreted and model our result by the Gross-Pitaveski equation. |
Thursday, June 8, 2023 8:36AM - 8:48AM |
Q08.00004: Coherent matter-wave emission from polaritonic quantum matter in an optical lattice Youngshin Kim, Alfonso Lanuza, Dominik Schneble With the recent development of polaritonic quantum systems and their promise for future quantum technologies, a fundamental understanding of their physics is highly desirable, especially out of equilibrium. Recently, we have implemented a versatile experimental platform for studying polariton physics with a state-selective optical lattice [1], in which the roles of matter and photons are played by lattice-trapped atoms and free matter-waves, respectively. In this talk, we report new work on coherent matter-wave emission from such radiatively coupled quantum matter. We study new regimes of polariton physics in a dissipation-free environment, including directional matter-wave emission, super- and subradiance with delayed feedback, and spontaneous coherence formation in the strongly-interacting regime. |
Thursday, June 8, 2023 8:48AM - 9:00AM |
Q08.00005: Beyond Dicke superradiance: matter-wave emission from polaritonic quantum matter. Alfonso Lanuza, Youngshin Kim, Dominik Schneble State-selective optical lattices have the capability of hosting ‘matter-wave polaritons’ (quasiparticles analogous to exciton-polaritons) by coupling lighter and heavier states of ultracold atoms [1]. In this talk, we discuss how a recent dynamical study of such a system [2] can be understood, in the highly coherent regime, as a collective de-excitation of an array of distant quantum emitters featuring diverse phenomena such as super- and subradiance, (quasi-)bound states in the continuum and directional emission induced by retardation. This contrasts with the strongly correlated case, which can lead to the buildup of excitonic coherence through collective spontaneous emission. |
Thursday, June 8, 2023 9:00AM - 9:12AM |
Q08.00006: Coherent control of Anderson localization in phase-modulated quasiperiodic lattices Yifei Bai, Toshihiko Shimasaki, Hasan Kondakci, Peter Dotti, Jared E Pagett, Max Prichard, Anna R Dardia, David M Weld We report recent experiments on the coherent control of Anderson localization by phason modulation in a quasiperiodic system. Despite the fact that the phason degree of freedom in the static 1D Aubry-André model doesn't affect the localization transition, we show both theoretically and experimentally that this localization transition can be controlled and destroyed completely by periodic phason modulation, without changing the pseudo-disorder strength. By experimentally observing the in-situ expansion of a BEC in a phase-modulated bichromatic lattice, we map out the rescaling of the effective disorder and observe the destruction of localization, demonstrate its use as a knob for coherent control of localization, and explore a possible protocol for reversing the apparent arrow of time. We elucidate connections between these phenomena and higher-dimensional dynamical localization in integer quantum Hall systems. |
Thursday, June 8, 2023 9:12AM - 9:24AM |
Q08.00007: Quantum transport of strongly interacting fermions in one dimension far out of equilibrium Jie Zou, Xiaopeng Li In the study of quantum transport, much has been known about dynamics near thermal equilibrium. However, quantum transport far away from equilibrium is much less well understood—the linear response approximation does not hold for physics far out of equilibrium in general. In this work, motivated by recent cold atom experiments on probing quantum many-body dynamics of a one-dimensional XXZ spin chain, where a transition from ballistic to diffusive dynamics has been established by increasing the interaction strengths, we study the strong interaction limit of the one-dimensional spinless fermion model, which is dual to the XXZ spin chain. We develop a highly efficient computation algorithm for simulating the nonequilibrium dynamics of this system exactly, and examine the nonequilibrium dynamics starting from a density modulation quantum state. We find ballistic transport in this strongly correlated setting and show that a plane-wave description emerges at long-time evolution. We also observe a sharp distinction between transport velocities in short and long times as induced by interaction effects and provide a quantitative interpretation for the long-time transport velocity. We expect our results to shed light on the understanding of the dynamics of the XXZ spin chain in the strong interaction regime. |
Thursday, June 8, 2023 9:24AM - 9:36AM |
Q08.00008: Manipulation of nonequilibrium spin dynamics of an ultracold gas in a moving optical lattice Cosmo T Binegar, Zachary N Hardesty-Shaw, Qingze Guan, Jared O Austin-Harris, Doerte Blume, Robert J Lewis-Swan, Yingmei Liu Ultracold quantum gases that feature spatial and spin degrees of freedom offer a powerful platform for simulating quantum magnetism in controlled, isolated settings. When combined with optical lattices, these simulation capabilities are exemplified by experimental studies featuring tunable dimensionality and filling factors. We have improved the programmability of the cold atom quantum simulator with a first realization of the dynamic interplay of spatial and spin degrees of freedom. We experimentally demonstrate that violent spatial evolutions tune long-lived coherent spin dynamics and develop a model of quantum spin-mixing incorporating the spatial evolution via time-dependent spin-spin interactions. Our results open new paths towards the simulation of quantum spin models with tunable interactions via tailored spatial dynamics. This tailored modulating of spatial profiles could be used to control the precise time dependence of the spin-spin interactions and realize Floquet-driven spin dynamics, which could have immediate applications for the dynamical generation of entangled spin states for quantum-enhanced sensing. |
Thursday, June 8, 2023 9:36AM - 9:48AM |
Q08.00009: Laser Probing of Alkali Rydberg-Rydberg Transitions with a Phase-Modulated Optical Lattice Ryan J Cardman, Georg A Raithel
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Thursday, June 8, 2023 9:48AM - 10:00AM |
Q08.00010: Observation of stochastic resonance in directed propagation of cold atoms Samir Bali, Alexander Staron, Kefeng Jiang, Casey Scoggins, Daniel Wingert, David Cubero Randomly diffusing atoms confined in a dissipative optical lattice are illuminated by a weak probe of light. The probe transmission spectrum reveals directed atomic propagation that occurs perpendicular to the direction of probe beam propagation. Resonant enhancement of this directed propagation is observed as we vary the random photon scattering rate. We experimentally characterize this stochastic resonance as a function of probe intensity and lattice well depth. A simple model reveals how the probe-excited atomic density waves and optical pumping rates conspire to create directed atomic propagation within a randomly diffusing sample. |
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