AMO@Stanford | Atomic, Molecular, and Optical Physics

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2 Events on Monday, December 2, 2019 Chen-Lung Hung ( U. Purdue) Quench dynamics and Townes soliton formation in two-dimensional Bose gases Monday, December 2, 2019 gcal 4:00 pm - 5:30 pm Abstract <p>Predicting the evolution of many-body systems under attractive interactions is a challenging</p><p>ask, owing to the instability to collapse. Bright solitons are remarkable stationary states, established when the self-focusing effect responsible for collapse is exactly compensated by wave dispersion. In two-dimensional (2D) Bose gases, however, such intricate balance cannot e fulfilled except at a critical norm known as the Townes threshold – only at which matter-wave right solitons can form. In this talk, I will discuss our recent study on the collapse dynamics in a omogeneous 2D Bose gas (formed by atomic cesium), when its interaction is quenched from epulsive to attractive via a Feshbach resonance [1]. We observe the formation of Townes solitons hrough the manifestation of modulational instability that results in the amplification of density wave disturbances and fragmentation of a 2D sample. Our high-resolution density measurements n space and time domain reveal detailed information about the formation process, from the amplified growth of density waves, the formation of 2D solitons, to the subsequent collision and collapse dynamics, demonstrating multiple universal behaviors in association with the formation f a stationary state. Towards the end of the talk, I will discuss our on-going plan for exploring on-equilibrium dynamics such as quantum critical transport, entanglement generation and istribution in a strongly-coupled 2D gas loaded in an optical lattice and with spatiotemporal control of atomic interactions.</p><p><br></p><p></p><p>1] Cheng-An Chen and Chen-Lung Hung, arXiv:1907.12550 (2019).</p>

Monday, April 6, 2020

gcal

12:00 am - 12:00 am

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