Observation of an Inverse Turbulent-Wave Cascade in a Driven Quantum Gas
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866913770832396288 |
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| author | Karailiev, Andrey Gazo, Martin Gałka, Maciej Eigen, Christoph Satoor, Tanish Hadzibabic, Zoran |
| author_facet | Karailiev, Andrey Gazo, Martin Gałka, Maciej Eigen, Christoph Satoor, Tanish Hadzibabic, Zoran |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_01537 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of an Inverse Turbulent-Wave Cascade in a Driven Quantum Gas Karailiev, Andrey Gazo, Martin Gałka, Maciej Eigen, Christoph Satoor, Tanish Hadzibabic, Zoran Quantum Gases Statistical Mechanics Atomic Physics Quantum Physics 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. |
| title | Observation of an Inverse Turbulent-Wave Cascade in a Driven Quantum Gas |
| topic | Quantum Gases Statistical Mechanics Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2405.01537 |