We present the general dielectric formalism for Bose-Einstein condensed systems in an external potential at finite temperatures. On the basis of a model arising within this framework as a first approximation in an intermediate-temperature region for the large condensate we calculate the damping of low-energy excitations in the collisionless regime.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - 1998|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics