Density matrix renormalization group for disordered bosons in one dimension

Physics – Condensed Matter

Scientific paper

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4 pages, 2 eps figures, uses RevTeX

Scientific paper

10.1209/epl/i1999-00302-7

We calculate the zero-temperature phase diagram of the disordered Bose-Hubbard model in one dimension using the density matrix renormalization group. For integer filling the Mott insulator is always separated from the superfluid by a Bose glass phase. There is a reentrance of the Bose glass both as a function of the repulsive interaction and of disorder. At half-filling where no Mott insulator exists, the superfluid density has a maximum where the kinetic and repulsive energies are about the same. Superfluidity is suppressed both for small and very strong repulsion but is always monotonic in disorder.

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