Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MO: Fachverband Molekülphysik
MO 12: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)
MO 12.35: Poster
Dienstag, 11. März 2025, 14:00–16:00, Tent
Quantum turbulence in a dipolar Bose gas at the anomalous non-thermal fixed point — •Niklas Rasch1 and Thomas Gasenzer1,2 — 1Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg — 2Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg
This work focuses on quantum turbulence in the vicinity of an anomalous non-thermal fixed point (NTFP) characterized by slow, subdiffusive coarsening of a length scale. The NTFP is approached in the temporal evolution of a quasi-2d dipolar Bose gas starting from variously sampled initial vortex configurations. Already in the early dynamics, we observe the build-up of an inverse energy cascade and recover Kolmogorov’s −5/3 power law in the incompressible energy spectrum. Due to the irreversible conversion of incompressible (vortices) into compressible energy (sound) this is understood in the context of decaying turbulence. By studying higher moments of the velocity circulation, we aim to understand the role that intermittency plays in the approach to a non-thermal fixed point. Further, using the high tunability of the anisotropic and long-range dipolar interaction we can probe its effects on the quantum turbulent behavior.
Keywords: Non-Thermal Fixed Points; Turbulence; Dipolar gases; non-equilibrium; energy cascade