0383920 - FZÚ 2013 RIV US eng J - Journal Article
Kauch, Anna - Byczuk, K. - Vollhardt, D.
Strong-coupling solution of the bosonic dynamical mean-field theory.
Physical Review B. Roč. 85, č. 20 (2012), "205115-1"-"205115-7". ISSN 1098-0121. E-ISSN 2469-9969
Institutional research plan: CEZ:AV0Z10100520
Keywords : strongly correlated bosons * dynamical mean-field theory * linked-cluster expansion * optical lattices * Mott insulators * superfluid
Subject RIV: BE - Theoretical Physics
Impact factor: 3.767, year: 2012 ; AIS: 1.429, rok: 2012
Result website:
http://prb.aps.org/abstract/PRB/v85/i20/e205115DOI: https://doi.org/10.1103/PhysRevB.85.205115

We derive an approximate analytical solution of the self-consistency equations of the bosonic dynamical mean-field theory (B-DMFT) in the strong-coupling limit. The approach is based on a linked-cluster expansion in the hybridization function of normal bosons around the atomic limit. The solution is used to compute the phase diagram of the bosonic Hubbard model for different lattices. We compare our results with numerical solutions of the B-DMFT equations and numerically exact methods, respectively. The very good agreement with those numerical results demonstrates that our approach captures the essential physics of correlated bosons both in the Mott insulator and in the superfluid phase.
Permanent Link: http://hdl.handle.net/11104/0213710