Optical Excitations in a Nonideal Bose Gas

Phys. Rev. Lett. 83, 6 – Published 5 July 1999
M. Ö. Oktel and L. S. Levitov


Optical excitations in a Bose gas are demonstrated to be 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 nondegenerate gas is manifest in a collision shift and dramatic narrowing of spectral lines. In the Bose-Einstein condensate 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 optical absorption spectrum for a uniform density system.

DOI: http://dx.doi.org/10.1103/PhysRevLett.83.6

  • Received 17 December 1998
  • Published in the issue dated 5 July 1999

© 1999 The American Physical Society

Authors & Affiliations

M. Ö. Oktel and L. S. Levitov

  • 12-112, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

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