Collective excitations of Bose-Einstein condensates in a double-well potential

Ippei Danshita; Kyota Egawa; Nobuhiko Yokoshi; Susumu Kurihara

doi:10.1143/JPSJ.74.3179

Collective excitations of Bose-Einstein condensates in a double-well potential

Ippei Danshita, Kyota Egawa, Nobuhiko Yokoshi, Susumu Kurihara

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	3179-3185
Number of pages	7
Journal	Journal of the Physical Society of Japan
Volume	74
Issue number	12
DOIs	https://doi.org/10.1143/JPSJ.74.3179
Publication status	Published - 2005 Dec

Keywords

Anomalous tunneling
Bogoliubov excitation
Bose-Einstein condensate
Double-well trap
Josephson effect

ASJC Scopus subject areas

Physics and Astronomy(all)

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abstract = "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.",

keywords = "Anomalous tunneling, Bogoliubov excitation, Bose-Einstein condensate, Double-well trap, Josephson effect",

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AU - Danshita, Ippei

AU - Egawa, Kyota

AU - Yokoshi, Nobuhiko

AU - Kurihara, Susumu

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AB - 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.

KW - Anomalous tunneling

KW - Bogoliubov excitation

KW - Bose-Einstein condensate

KW - Double-well trap

KW - Josephson effect

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