| Autor: |
Larson, J., Collin, A., Martikainen, J. -P. |
| Rok vydání: |
2008 |
| Předmět: |
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| Zdroj: |
Phys. Rev. A 79, 033603 (2009) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevA.79.033603 |
| Popis: |
We study a gas of repulsively interacting bosons in an optical lattice and explore the physics beyond the lowest band Hubbard model. Utilizing a generalized Gutzwiller ansatz, we find how the lowest band physics is modified by the inclusion of the first excited bands. In contrast to the prediction of the lowest band Bose-Hubbard model, a reentrant behavior of superfluidity is envisaged as well as decreasing width of the Mott lobes at strong coupling. |
| Databáze: |
arXiv |
| Externí odkaz: |
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