Hydrodynamic response of a trapped superfluid to a periodic perturbation

In this article, we discuss the hydrodynamic response of a superfluid to a periodic drive. Using a WKB description of the hydrodynamic modes of the system, we show that contrary to Landau’s argument, there is no critical velocity, but that the dissipated power nevertheless increases rapidly when the...

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Veröffentlicht in:	The European physical journal. ST, Special topics Special topics, 2019-03, Vol.227 (15-16), p.2263-2273
Hauptverfasser:	Jin, Shuwei, Laurent, Sébastien, Chevy, Frédéric
Format:	Artikel
Sprache:	eng
Schlagworte:	Acoustic velocity Atomic Classical and Continuum Physics Condensed Matter Physics Critical velocity Fluids Materials Science Measurement Science and Instrumentation Molecular Non-equilibrium Dynamics: Quantum Systems and Foundations of Quantum Mechanics Optical and Plasma Physics Periodic variations Perturbation Physics Physics and Astronomy Regular Article Superfluidity
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Zusammenfassung:	In this article, we discuss the hydrodynamic response of a superfluid to a periodic drive. Using a WKB description of the hydrodynamic modes of the system, we show that contrary to Landau’s argument, there is no critical velocity, but that the dissipated power nevertheless increases rapidly when the maximum velocity of the perturbation reaches the central sound velocity of the superfluid.
ISSN:	1951-6355 1951-6401
DOI:	10.1140/epjst/e2018-800024-0