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arXiv · 2405.01537

Observation of an Inverse Turbulent-Wave Cascade in a Driven Quantum Gas

Andrey Karailiev·Martin Gazo·Maciej Gałka·Christoph Eigen·Tanish Satoor·Zoran Hadzibabic
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Abstract

We observe an inverse turbulent-wave cascade, from small to large lengthscales, in a driven homogeneous 2D Bose gas. Starting with an equilibrium condensate, we drive the gas isotropically on a lengthscale much smaller than its size, and observe a nonthermal population of modes with wavelengths larger than the drive one. At long drive times, the gas exhibits a steady nonthermal momentum distribution. At lengthscales increasing from the drive one to the system size, this 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 reminiscent of a nonthermal fixed point associated with universal coarsening in an isolated 2D gas. In further experiments, based on anisotropic driving, we reveal the complete qualitative picture of how the steady-state cascade forms.

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Andrey Karailiev, Martin Gazo, Maciej Gałka, Christoph Eigen, Tanish Satoor, Zoran Hadzibabic. 2024-05-02. Observation of an Inverse Turbulent-Wave Cascade in a Driven Quantum Gas. https://doi.org/10.1103/physrevlett.133.243402

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