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

Michael Knap, Enrico Arrigoni, and Wolfgang von der Linden
Phys. Rev. B 81, 024301 – Published 4 January 2010

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 2 October 2009

DOI:https://doi.org/10.1103/PhysRevB.81.024301

©2010 American Physical Society

Authors & Affiliations

Michael Knap*, Enrico Arrigoni, and Wolfgang von der Linden

  • Institute of Theoretical and Computational Physics, Graz University of Technology, 8010 Graz, Austria

  • *michael.knap@tugraz.at

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 81, Iss. 2 — 1 January 2010

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×