Fast Thermalization and Helmholtz Oscillations of an Ultracold Bose Gas
Authors: Papoular D. J., Pitaevskii L. P., Stringari S.
Autors Affiliation: 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.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 113 (17) Pages from: 170601 to: 170601
More Information: 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.113.170601Citations: 8data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-01-12References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here