J. Phys. Soc. Jpn. 74, pp. 3179-3185 (2005) [7 Pages]
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Received July 30, 2005; Accepted September 22, 2005
We investigate collective excitations of Bose–Einstein condensates at absolute zero in a double-well trap. We solve the Bogoliubov equations with a double-well trap, and show that the crossover from the dipole mode to the Josephson plasma mode occurs in the lowest energy excitation. It is found that the anomalous tunneling property of low energy excitations is crucial to the crossover.
©2005 The Physical Society of Japan
KEYWORDS: Bose–Einstein condensate, Bogoliubov excitation, double-well trap, Josephson effect, anomalous tunneling
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