TY - JOUR
T1 - Spectral properties of strongly correlated bosons in two-dimensional optical lattices
AU - Knap, Michael
AU - Arrigoni, Enrico
AU - Von Der Linden, Wolfgang
PY - 2010/1/4
Y1 - 2010/1/4
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77954777878&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.81.024301
DO - 10.1103/PhysRevB.81.024301
M3 - Article
AN - SCOPUS:77954777878
SN - 1098-0121
VL - 81
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 2
M1 - 024301
ER -