Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session Q07: Trapped Gases Driven Out-of-Equilibrium
8:00 AM–10:00 AM,
Thursday, June 3, 2021
Chair: Maren Mossman, University of San Diego
Abstract: Q07.00008 : Observation of Real-Time Dynamics of a Direct Turbulent Cascade in a Bose FlatlandĀ
9:24 AM–9:36 AM
Live
Presenter:
Maciej Galka
(Univ of Cambridge)
Authors:
Maciej Galka
(Univ of Cambridge)
Andrey Karailiev
(Univ of Cambridge)
Martin Gazo
(Univ of Cambridge)
Panagiotis Christodoulou
(Univ of Cambridge)
Nishant Dogra
(Univ of Cambridge)
Julian Schmitt
(Univ Bonn)
Zoran Hadzibabic
(Univ of Cambridge)
Our experimental protocol starts with exciting the lowest-lying phonon mode with a strong continuous shaking of the atomic cloud via a time-varying magnetic field gradient. This leads to the formation of a direct energy turbulent cascade which is revealed by a power-law momentum distribution. We further study the pre-steady state dynamics, as the cascade’s front propagates to higher momentum states. We observe a spatio-temporal self-similar evolution of the momentum spectrum and compare it to the weak-wave turbulence predictions. Our results also provide a link to recently emerging general classification of out of equilibrium dynamics, to so-called non-thermal fixed points.
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