Temperature-Dependent Damping and Frequency Shifts in Collective Excitations of a Dilute Bose-Einstein Condensate

D. S. Jin; M. R. Matthews; J. R. Ensher; C. E. Wieman; E. A. Cornell

doi:10.1103/PhysRevLett.78.764

Temperature-Dependent Damping and Frequency Shifts in Collective Excitations of a Dilute Bose-Einstein Condensate

D. S. Jin, M. R. Matthews, J. R. Ensher, C. E. Wieman, and E. A. Cornell

Phys. Rev. Lett. 78, 764 – Published 3 February 1997

Abstract

We extend to finite temperature the study of collective excitations of a Bose-Einstein condensate in a dilute gas of $^{87} Rb$ . Measurements of two modes with different angular momenta show unexpected temperature-dependent frequency shifts, with very different behavior for the two symmetries; in addition there is a sharp feature in the temperature dependence of one mode. The damping of these excitations exhibits dramatic temperature dependence, with condensate modes at temperatures near the transition damping even faster than analogous noncondensate oscillations.

Received 29 October 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.764

Authors & Affiliations

D. S. Jin, M. R. Matthews, J. R. Ensher, C. E. Wieman, and E. A. Cornell

Joint Institute for Laboratory Astrophysics, National Institute of Standards and Technology and University of Colorado, and Physics Department, University of Colorado, Boulder, Colorado 80309-0440