Mean-field phase diagram for Bose-Hubbard Hamiltonians with random hopping

Year: 2007

Authors: Buonsante P., Massel F., Penna V., Vezzani A.

Autors Affiliation: Dipartimento di Fisica, Politecnico di Torino; Dipartimento di Fisica, Università degli Studi di Parma and CNR-INFM

Abstract: The zero temperature phase diagram for ultracold bosons in a random 1D potential is obtained through a site decoupling mean-field scheme performed over a Bose-Hubbard (BH) Hamiltonian, whose hopping term is considered as a random variable. As for the model with random on-site potential, the presence of disorder leads to the appearance of a Bose glass phase. The different phases-i.e., Mott insulator, superfluid, and Bose glass-are characterized in terms of condensate fraction and superfluid fraction. Furthermore, the boundary of the Mott lobes is related to an off-diagonal Anderson model featuring the same disorder distribution as the original BH Hamiltonian.

Journal/Review: LASER PHYSICS

Volume: 17 (4)      Pages from: 538  to: 544

KeyWords: ultracold atoms; optical lattices; disordered system; quantum phases;
DOI: 10.1134/S1054660X07040378

Citations: 11
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