Quantum glass phases in the disordered Bose-Hubbard model

Details Quantum glass phases in the disordered Bose-Hubbard model Quantum glass phases in the disordered Bose-Hubbard model

2007-08-15

arxiv.org/abs/0708.2107v1

Phys. Rev. Lett. 99, 050403 (2007)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Scientific paper

10.1103/PhysRevLett.99.050403

The phase diagram of the Bose-Hubbard model in the presence of off-diagonal disorder is determined using Quantum Monte Carlo simulations. A sequence of quantum glass phases intervene at the interface between the Mott insulating and the Superfluid phases of the clean system. In addition to the standard Bose glass phase, the coexistence of gapless and gapped regions close to the Mott insulating phase leads to a novel Mott glass regime which is incompressible yet gapless. Numerical evidence for the properties of these phases is given in terms of global (compressibility, superfluid stiffness) and local (compressibility, momentum distribution) observables.

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