Fast Thermalization and Helmholtz Oscillations of an Ultracold Bose Gas

D. J. Papoular, L. P. Pitaevskii, and S. Stringari
Phys. Rev. Lett. 113, 170601 – Published 20 October 2014

Abstract

We analyze theoretically the transport properties of a weakly interacting ultracold Bose gas enclosed in two reservoirs connected by a constriction. We assume that the transport of the superfluid part is hydrodynamic, and we describe the ballistic transport of the normal part using the Landauer-Büttiker formalism. Modeling the coupled evolution of the phase, atom number, and temperature mismatches between the reservoirs, we predict that Helmholtz (plasma) oscillations can be observed at nonzero temperatures below Tc. We show that, because of its strong compressibility, the Bose gas is characterized by a fast thermalization compared to the damping time for plasma oscillations, accompanied by a fast transfer of the normal component. This fast thermalization also affects the gas above Tc, where we present a comparison to the ideal fermionic case. Moreover, we outline the possible realization of a superleak through the inclusion of a disordered potential.

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  • Received 23 May 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.170601

© 2014 American Physical Society

Authors & Affiliations

D. J. Papoular1,*, L. P. Pitaevskii1,2, and S. Stringari1

  • 1INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy
  • 2Kapitza Institute for Physical Problems, Kosygina 2, 119334 Moscow, Russia

  • *Corresponding author. papoular@science.unitn.it

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Vol. 113, Iss. 17 — 24 October 2014

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