Quantum phases in an optical lattice
D. van OostenDebye Institute, University of Utrecht, Princetonplein 5, 3584 CC Utrecht, The NetherlandsP. van der StratenDebye Institute, University of Utrecht, Princetonplein 5, 3584 CC Utrecht, The NetherlandsH. T. C. StoofInstitute for Theoretical Physics, University of Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands
2001en
ABI
Annotatsiya
We present the zero-temperature phase diagram of bosonic atoms in an optical lattice, using two different mean-field approaches. The phase diagram consists of various insulating phases and a superfluid phase. We explore the nature of the insulating phase by calculating both the quasiparticle and quasihole dispersion relation. We also determine the parameters of our single band Bose-Hubbard model in terms of the microscopic parameters of the atoms in the optical lattice.
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