Density matrix renormalization group for disordered bosons in one dimension
Universität München - Theresienstr. 37/III
D-80333 München, Germany
Accepted: 29 March 1999
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 re-entrance 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.
PACS: 05.30.Jp – Boson systems / 67.40.Db – Quantum statistical theory; ground state, elementary excitations / 67.40.Yv – Impurities and other defects
© EDP Sciences, 1999