Excitations in disordered bosonic optical lattices

Details Excitations in disordered bosonic optical lattices Excitations in disordered bosonic optical lattices

2010-07-16

arxiv.org/abs/1007.2716v2

Phys. Rev. A 82, 053628 (2010)

Physics

Condensed Matter

Quantum Gases

8 pages, 7 figures, version as published

Scientific paper

10.1103/PhysRevA.82.053628

Spectral excitations of ultracold gases of bosonic atoms trapped in one dimensional optical lattices with disorder are investigated by means of the variational cluster approach applied to the Bose-Hubbard model. In particular, qualitatively different disorder distributions typically employed in experiments are considered. The computed spectra exhibit a strong dependence on both the shape of the disorder distribution and the disorder strength. We compare alternative results for the Mott gap obtained from its formal definition and from the minimum peak distance, which is the quantity available from experiments.

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