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Bogoliubov sound speed in periodically modulated Bose-Einstein condensates

PHYSICAL REVIEW A, no. 5 (2003)

Cited by: 64|Views2

Abstract

We study the Bogoliubov excitations of a Bose-condensed gas in an optical lattice having arbitrary spatial dimensions. Of primary interest is the long-wavelength phonon dispersion for both current-free and current-carrying condensates. We obtain the phonon sound speed by carrying out a systematic expansion of the Bogoliubov equations in p...More

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