Physics – Condensed Matter
Scientific paper
1999-01-11
Physics
Condensed Matter
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.
Rapsch S.
Schollwoeck Ulrich
Zwerger Wilhelm
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