Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Wave turbulence in a homogenous 2D Bose gas

Jul 19, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session


Turbulence is a multi-scale phenomenon, found in systems ranging from non-linear optics to the dynamics of the early universe. While turbulence escapes a complete microscopic understanding it is commonly associated with cascades, transporting system-specific conserved quantities, across different length scales.

Here, we employ a two-dimensional and homogenous ultracold Bose gas – a system with a high degree of experimental tunability – to study wave turbulence. A time-varying magnetic field gradient is used to excite a longest wavelength phonon mode, which under strong driving forms a direct energy cascade from low wavenumbers to high wavenumbers, where the dissipation scale lies. Using complimentary techniques, the system is probed on all length and time scales providing a view from individual quantum states to the full momentum distribution. We reveal two major theoretical cornerstones of turbulence formation: the establishment of the isotropic direct cascade, characterised by a power law, under anisotropic forcing; and the spatiotemporal scaling of the momentum distribution at times before any energy dissipation.

Rather than simply driving the longest wavelength mode, we are also able to excite shorter wavelength modes lying at intermediate wavenumbers using a Digital Micromirror Device. In this scenario, a dual system of two cascades where energy propagates to higher wavenumbers and particle number to lower wavenumbers is expected.



Presenter name Andrey Karailiev
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Primary authors

Andrey Karailiev (University of Cambridge) Martin Gazo Dr Panagiotis Christodoulou (University of Cambridge) Mr Mohamed Warda (University of Cambridge) Dr Nishant Dogra (University of Cambridge) Dr Julian Schmitt (University of Bonn) Mr Maciej Galka (University of Cambridge) Prof. Zoran Hadzibabic (University of Cambridge)

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