Phys.org March 15, 2023
In macroscopic quantum condensates the quasiclassical turbulent dynamics at large scales is altered at small scales, where the quantization of vorticity is essential. The nature of this transition remains an unanswered question. An international team of researchers (Finland, UK, Israel) expanded the concept of wave-driven turbulence to rotating quantum fluids where the spectrum of waves extends to microscopic scales as Kelvin waves on quantized vortices. They excited inertial waves at the largest scale by periodic modulation of the angular velocity and observed dissipation-independent transfer of energy to smaller scales and the eventual onset of the elusive Kelvin wave cascade at the lowest temperatures. They found that energy is pumped to the system through a boundary layer distinct from the classical Ekman layer and support their observations with numerical simulations. According to the researchers thier experiments demonstrated a regime of turbulent motion in quantum fluids where the role of vortex reconnections can be neglected, thus stripping the transition between the classical and the quantum regimes of turbulence down to its constituent components… read more. Open Access TECHNICAL ARTICLEÂ
Experimental principles. Credit: Nature Physics, 02 March 2023Â