IQP Seminar: Matter-wave interferometry of quenched 2D Bose gases to investigate nonequilibrium many-body quantum behaviour

by Christopher Foot (U Oxford)

Wednesday 10 Jan 2024, 13:30 → 15:00 Europe/Berlin

ZOQ Center for Optical Quantum Technologies, Luruper Chaussee 149, bldg. 69

Abstract:

The understanding of nonequilibrium dynamics in many-body quantum systems is a fundamental issue in statistical physics. We have carried out experiments that probe universal properties of these systems by measuring universal dynamics triggered by a quench from the superfluid to normal phase across the Berezinskii-Kosterlitz-Thouless transition in a two-dimensional (2D) Bose gas. By splitting the 2D gas in two we suddenly reduce the density to quench the system across the critical point. The subsequent relaxation dynamics were probed with matter-wave interferometry to measure the local phase fluctuations. We show that the time evolution of both the phase correlation function and vortex density obeys universal scaling laws. This conclusion is interpreted by means of real-time renormalization group theory. In addition to results reported in [1], directions for future investigation will be discussed.

[1] Universal scaling of the dynamic BKT transition in quenched 2D Bose gases. Science, 382, 443 (2023).
Shinichi Sunami, Vijay Singh, David Garrick, Abel Beregi, Adam Barker, Kathrin Luksch, Elliot Bentine, Ludwig Mathey, Christopher Foot



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The event will take place in the ZOQ seminar room, with a hybrid option.

 

Zoom data, for the entire semester:

https://uni-hamburg.zoom.us/j/63754275322?pwd=OVYzMXJSUzdyTE0zN0FOYitsSVA3QT09

Meeting-ID: 637 5427 5322
Kenncode: 58810268
 

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Upcoming events:

Jan 31  Sebastian Will (Columbia U)