Fast thermalization and Helmholtz oscillations of an ultracold Bose gas
| Autor: | Sandro Stringari, Lev P. Pitaevskii, D. J. Papoular |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Bose gas FOS: Physical sciences General Physics and Astronomy Plasma Plasma oscillation Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Superfluidity symbols.namesake Thermalisation Quantum Gases (cond-mat.quant-gas) Ballistic conduction Helmholtz free energy Compressibility symbols Atomic physics Condensed Matter - Quantum Gases |
| Zdroj: | Physical review letters 113 (2014): 170601–170601. doi:10.1103/PhysRevLett.113.170601 info:cnr-pdr/source/autori:Papoular, D. J.; Pitaevskii, L. P.; Stringari, S./titolo:Fast Thermalization and Helmholtz Oscillations of an Ultracold Bose Gas/doi:10.1103%2FPhysRevLett.113.170601/rivista:Physical review letters (Print)/anno:2014/pagina_da:170601/pagina_a:170601/intervallo_pagine:170601–170601/volume:113 |
| Popis: | 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, induced by an initial imbalance in atom numbers, can be observed at non-zero temperatures below Tc. We show that, because of its strong compressibility, the ultracold 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 through the constriction. This fast thermalization also affects the gas above Tc, where we present an explicit comparison to the ideal fermionic case. 5 pages, 5 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|