Observation of an inverse turbulent-wave cascade in a driven quantum gas
- URL: http://arxiv.org/abs/2405.01537v1
- Date: Thu, 2 May 2024 17:59:55 GMT
- Title: Observation of an inverse turbulent-wave cascade in a driven quantum gas
- Authors: Andrey Karailiev, Martin Gazo, Maciej Gałka, Christoph Eigen, Tanish Satoor, Zoran Hadzibabic,
- Abstract summary: We observe an inverse turbulent-wave cascade, from small to large lengthscales, in a homogeneous 2D Bose gas driven isotropically on a lengthscale much smaller than its size.
At increasing lengthscales, the steady-state momentum distribution features in turn: (i) a power-law spectrum, with an exponent close to the analytical result for a particle cascade in weak-wave turbulence, and (ii) a spectrum intriguingly reminiscent of a nonthermal fixed point associated with universal coarsening in an isolated 2D gas.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We observe an inverse turbulent-wave cascade, from small to large lengthscales, in a homogeneous 2D Bose gas driven isotropically on a lengthscale much smaller than its size. Starting with an equilibrium condensed gas, at long drive times we observe a nonthermal steady state. At increasing lengthscales, starting from the forcing one, the steady-state momentum distribution features in turn: (i) a power-law spectrum, with an exponent close to the analytical result for a particle cascade in weak-wave turbulence, and (ii) a spectrum intriguingly reminiscent of a nonthermal fixed point associated with universal coarsening in an isolated 2D gas. In further experiments, based on anisotropic driving, we also reveal the qualitative picture of the cascade-formation dynamics.
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