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/S1054660X07040378ImpactFactor: 0.696Citations: 11data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-10References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here