Abstract The energy band structure of spin-1 condensates with repulsive spin-independent and either ferromagnetic or antiferromagnetic spin-dependent interactions in one-dimensional (1D) periodic optical lattices is discussed. Within the two-mode approximation, Bloch bands of spin-1 condensates are presented. The results show that the Bloch bands exhibit a complex structure as the atom density of mF=0 hyperfine state increases: bands splitting, reversion, intersection and loop structure are excited subsequently. The complex band structure should be related to the tunneling and spin-mixing dynamics.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10774120 and 10975114), the Natural Science Foundation of Gansu Province of China (Grant No. 3ZS051-A25-013), and the Natural Science Foundation of Northwest Normal University of China (Grant Nos. NWNU-KJCXGC-03-48 and NWNU-KJCXGC-03-17).
Cite this article:
Li Zhi(李志), Zhang Ai-Xia(张爱霞), Ma Juan(马娟), and Xue Ju-Kui(薛具奎) Energy band structure of spin-1 condensates in optical lattices 2010 Chin. Phys. B 19 100306
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