Quantum Numbers for Excitations of Bose-Einstein Condensates in 1D Optical Lattices
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- Isoshima Tomoya
- Materials Physics Laboratory, Helsinki University of Technology Institute of Physics, Academia Sinica
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- Salomaa Martti M.
- Materials Physics Laboratory, Helsinki University of Technology Department of Physics, Kinki University
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Abstract
The excitation spectrum and the band structure of a Bose–Einstein condensate in a periodic potential are investigated. Analyses within full 3D systems, finite 1D systems, and ideal periodic 1D systems are compared. We find two branches of excitations in the spectra of the finite 1D model. The band structures for the first and (part of) the second band are compared between a finite 1D and the fully periodic 1D systems, utilizing a new definition of an effective wavenumber and a phase-slip number. The upper and lower edges of the first gap coincide well between the two cases. The remaining difference is explained by the existence of the two branches due to the finite-size effect.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 73 (11), 3083-3086, 2004
THE PHYSICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282679162967168
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- NII Article ID
- 110001979260
- 130004538621
- 210000105151
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- NII Book ID
- AA00704814
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- BIBCODE
- 2004JPSJ...73.3083I
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 7157009
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed