Author： Rapsch S. Schollwöck U. Zwerger W.
Publisher： Edp Sciences
E-ISSN： 1286-4854|46|5|559-564
ISSN： 0295-5075
Source： EPL (EUROPHYSICS LETTERS), Vol.46, Iss.5, 2010-03, pp. : 559-564
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Abstract
We calculate the zero-temperature phase diagram of the disorderedBose-Hubbardmodel in one dimension using the density matrix renormalization group.For integer filling the Mott insulator is always separated from thesuperfluid by a Bose glass phase. There is a re-entrance of the Bose glassboth as a function of the repulsive interactionand ofdisorder. At half-filling where no Mott insulator exists, the superfluiddensity has a maximum where the kinetic and repulsive energies are aboutthesame. Superfluidity is suppressed both for small and very strong repulsionbut is always monotonic in disorder.
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