Transition to quantum turbulence in a finite size superfluid

Details Transition to quantum turbulence in a finite size superfluid Transition to quantum turbulence in a finite size superfluid

2011-05-11

arxiv.org/abs/1105.2106v2

Laser Phys. Lett. 8, No. 5, 393-397 (2011)

Physics

Condensed Matter

Quantum Gases

Scientific paper

10.1002/lapl.201110005

A novel concept of quantum turbulence in finite size superfluids, such as trapped bosonic atoms, is discussed. We have used an atomic $^{87}\mathrm{Rb}$ BEC to study the emergence of this phenomenon. In our experiment, the transition to the quantum turbulent regime is characterized by a tangled vortex lines formation, controlled by the amplitude and time duration of the excitation produced by an external oscillating field. A simple model is suggested to account for the experimental observations. The transition from the non-turbulent to the turbulent regime is a rather gradual crossover. But it takes place in a sharp enough way, allowing for the definition of an effective critical line separating the regimes. Quantum turbulence emerging in a finite-size superfluid may be a new idea helpful for revealing important features associated to turbulence, a more general and broad phenomenon.

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