Spectral properties of strongly correlated bosons in two-dimensional optical lattices

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Abstract

Spectral properties of the two-dimensional Bose-Hubbard model, which emulates ultracold gases of atoms confined in optical lattices, are investigated by means of the variational cluster approach. The phase boundary of the quantum phase transition from Mott phase to superfluid phase is calculated and compared to recent work. Moreover the single-particle spectral functions in both the first and the second Mott lobe are presented and the corresponding densities of states and momentum distributions are evaluated. A qualitatively similar intensity distribution of the spectral weight can be observed for spectral functions in the first and the second Mott lobe.
Original languageEnglish
Pages (from-to)024301
Number of pages1
JournalPhysical Review / B
Volume81
Issue number2
DOIs
Publication statusPublished - 2010

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Optical lattices
Bosons
lobes
bosons
Hubbard model
Phase boundaries
Momentum
Gases
Phase transitions
momentum
Atoms
gases
atoms

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  • Theoretical

Cite this

Spectral properties of strongly correlated bosons in two-dimensional optical lattices. / Knap, Michael; Arrigoni, Enrico; von der Linden, Wolfgang.

In: Physical Review / B, Vol. 81, No. 2, 2010, p. 024301.

Research output: Contribution to journalArticleResearchpeer-review

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