Branch structure of the Bose-condensate excitations spectrum

V.S. Yarunin and L.A. Siurakshina

Physica A: Statistical Mechanics and its Applications, 1995, vol. 215, issue 3, 261-269

Abstract: The two-branch excitation spectrum of the non-ideal Bose-gas is obtained by the Path Integral method for the canonical distribution with constraint. Reorganization of the spectrum happens for a value of the condensate density, providing the balance between attraction and repulsion forces of the interaction potential. Two branches show different dependence on the temperature, Bose-condensate density and stability relative to the quantum fluctuations of atom amplitudes. A qualitative similarity of the properties of these branches with the recently observed experimental structure of neutron sharp peak scattering is found.

Date: 1995
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:215:y:1995:i:3:p:261-269

DOI: 10.1016/0378-4371(94)00304-C

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