Kurdestany, Jamshid Moradi and Pai, Ramesh V and Pandit, Rahul (2012) The inhomogeneous extended Bose-Hubbard model: A mean-field theory. In: Annalen der Physik, 524 (3-4, S). pp. 234-244.Full text not available from this repository.
We develop an inhomogeneous mean-field theory for the extended Bose-Hubbard model with a quadratic, confining potential. In the absence of this potential, our mean-field theory yields the phase diagram of the homogeneous extended Bose-Hubbard model. This phase diagram shows a superfluid (SF) phase and lobes of Mott-insulator (MI), density-wave (DW), and supersolid (SS) phases in the plane of the chemical potential mu and on-site repulsion U; we present phase diagrams for representative values of V, the repulsive energy for bosons on nearest-neighbor sites. We demonstrate that, when the confining potential is present, superfluid and density-wave order parameters are nonuniform; in particular, we obtain, for a few representative values of parameters, spherical shells of SF, MI, DW, and SS phases. We explore the implications of our study for experiments on cold-atom dipolar condensates in optical lattices in a confining potential.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to John Wiley and Sons.|
|Keywords:||Bose-Hubbard model;superfluid phase;Mott-insulator; density-wave;supersolid|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||01 May 2012 10:22|
|Last Modified:||01 May 2012 10:22|
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