Optical excitations in a non-ideal Bose gas

Preprint

14 December 1998

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9812217

Abstract

Optical excitations in a Bose gas are demonstrated to be very sensitive to many-body effects. At low temperature the momentum relaxation is provided by momentum exchange collisions, rather than by elastic collisions. A collective excitation mode forms, which in a Boltzmann gas is manifest in a collision shift and dramatic narrowing of spectral lines. In the BEC state, each spectral line splits into two components. The doubling of the optical excitations results from the physics analogous to that of the second sound. We present a theory of the line doubling, and calculate the oscillator strengths and linewidth.

Keywords

OSCILLATOR STRENGTHS
OPTICAL EXCITATIONS
SPECTRAL LINES
GAS OPTICAL
IDEAL BOSE
COLLISIONS
BOSE GAS

All Related Versions

Version 1, 1998-12-14, ArXiv
Published version: Physical Review Letters, 83 (1), 6.

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