Observation of an inverse turbulent-wave cascade in a driven quantum gas

• Verfasst von: Karailiev, Andrey [VerfasserIn]
• Verfasst von: Gazo, Martin [VerfasserIn]
• Verfasst von: Galka, Maciej [VerfasserIn]
• Verfasst von: Eigen, Christoph [VerfasserIn]
• Verfasst von: Satoor, Tanish [VerfasserIn]
• Verfasst von: Hadzibabic, Zoran [VerfasserIn]
• Titel: Observation of an inverse turbulent-wave cascade in a driven quantum gas
• Verf.angabe: Andrey Karailiev, Martin Gazo, Maciej Gałka, Christoph Eigen, Tanish Satoor, and Zoran Hadzibabic
• E-Jahr: 2024
• Jahr: 9 December 2024
• Umfang: 6 S.
• Illustrationen: Illustrationen
• Fussnoten: Gesehen am 07.03.2025
• Titel Quelle: Enthalten in: Physical review letters
• Ort Quelle: College Park, Md. : APS, 1958
• Jahr Quelle: 2024
• Band/Heft Quelle: 133(2024), 24, Artikel-ID 243402, Seite 1-6
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.133.243402
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1919306447

Abstract

We observe an inverse turbulent-wave cascade, from small to large length scales, in a driven homogeneous 2D Bose gas. Starting with an equilibrium condensate, we drive the gas isotropically on a length scale 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 length scales 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.