Theory of excitations of the condensate and non-condensate at finite temperatures

Дата и время публикации : 1999-01-18T19:30:18Z

Авторы публикации и институты :
Allan Griffin

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: Lectures given at the BEC Varenna Summer School, July 7-17,1998. To be published in “Bose-Einstein Condensation in Atomic Gases”, edited by M.Inguscio, S.Stringari and C. Wieman (Italian Physical Society,1999). PDF figure files are available from the sender
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: We give an overview of the current theory of collective modes in trapped atomic gases at finite temperatures, when the dynamics of the condensate and non-condensate must both be considered. A simple introduction is given to the quantum field formulation of the dynamics of an interacting Bose-condensed system, based on equations of motion for the condensate wavefunction and single-particle Green’s functions for the non-condensate atoms. We discuss the nature of excitations in the mean-field collisionless region, including the Beliaev second-order approximation for the self-energies. We also sketch the derivation of coupled two-fluid hydrodynamic equations using a simple kinetic equation which includes collisions between condensate and non-condensate atoms.

Category: Physics