Fast Thermalization and Helmholtz Oscillations of an Ultracold Bose Gas

Anno: 2014

Autori: Papoular D. J., Pitaevskii L. P., Stringari S.

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

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-Buttiker 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 T-c. 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 T-c, 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.


Volume: 113 (17)      Da Pagina: 170601  A: 170601

Maggiori informazioni: We are grateful to S. Balibar, I. Carusotto, G. Ferrari, and A. Georges for fruitful discussions. This work has been supported by the European Research Council (ERC) through the QGBE grant.
DOI: 10.1103/PhysRevLett.113.170601

Citazioni: 11
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2022-06-26
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