Finite-temperature theory of the scissors mode in a Bose gas using the moment method

Research output: Contribution to journalArticle

Abstract

We use a generalized Gross-Pitaevskii equation for the condensate and a semiclassical kinetic equation for the noncondensate atoms to discuss the scissors mode in a trapped Bose-condensed gas at finite temperatures. Both equations include the effect of collisions between the condensate and noncondensate atoms. We solve the coupled moment equations describing oscillations of the quadrupole moments of the condensate and noncondensate components to find the collective-mode frequencies and collisional damping rates as a function of temperature. Our calculations extend those of Guéry-Odelin and Stringari at [Formula Presented] and in the normal phase. They complement the numerical results of Jackson and Zaremba, although Landau damping is left out of our approach. Our results are also used to calculate the quadrupole response function, which is related to the moment of inertia. It is shown explicitly that the moment of inertia of a trapped Bose gas at finite temperatures involves a sum of an irrotational component from the condensate and a rotational component from the thermal-cloud atoms.

Original languageEnglish
Number of pages1
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume65
Issue number3
DOIs
Publication statusPublished - 1 Jan 2002

Fingerprint Dive into the research topics of 'Finite-temperature theory of the scissors mode in a Bose gas using the moment method'. Together they form a unique fingerprint.

  • Cite this