Physics – Condensed Matter
Scientific paper
1998-03-13
J. Phys. Soc. Jpn. 67, 1822 (1998).
Physics
Condensed Matter
4 pages, 1 eps figure
Scientific paper
10.1143/JPSJ.67.1822
The Bogoliubov theory is extended to a Bose-Einstein condensation with internal degrees of freedom, realized recently in $^{23}$Na gases where several hyperfine states are simultaneously cooled optically. Starting with a Hamiltonian constructed from general gauge and spin rotation symmetry principles fundamental equations for condensate are derived. The ground state where time reversal symmetry is broken in some case and low-lying collective modes, e.g. spin and density wave modes, are discussed. Novel vortex as a topological defect can be created experimentally.
Machida Kazushige
Ohmi Tetsuo
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