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Phys. Rev. A 70, 023605 (2004) [8 pages]

Superfluid–Mott-insulator transition of spin-2 cold bosons in an optical lattice in a magnetic field

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Shuo Jin1,*, Jing-Min Hou1,†, Bing-Hao Xie2,‡, Li-Jun Tian1,§, and Mo-Lin Ge1
1Theoretical Physics Division, Nankai Institute of Mathematics, Nankai University, Tianjin, 300071, China, and Liuhui Center for Applied Mathematics, Tianjin, 300071, China
2Laboratory for Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China

Received 4 August 2003; revised 17 May 2004; published 19 August 2004

The superfluid–Mott-insulator transition of spin-2 boson atoms with repulsive interaction in an optical lattice in a magnetic field is presented. By using the mean-field theory, the Mott ground states and phase diagrams of the superfluid–Mott-insulator transition at zero temperature are revealed. An applied magnetic field leads to splitting of some phase boundaries. For all the initial Mott ground states containing multiple spin components, different spin components take on different phase boundaries. It is found that in this system phase boundaries with different magnetization can be moved in different ways by changing only the intensity of the applied magnetic field.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.023605
DOI:
10.1103/PhysRevA.70.023605
PACS:
03.75.Kk, 03.75.Lm, 03.75.Mn, 32.80.Pj

*Electronic address: jinshuo@eyou.com; Also at Department of Physics, School of Science, Beihang University, Beijing, 100083, China.

†Electronic address: jmhou@eyou.com

‡Also at Beijing Information Technology Institute, Beijing, 100101, China.

§Also at Department of Physics, Shanghai University, Shanghai, 200436, China.

 
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