Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Quantum gases: Optical lattices I

Q 31.7: Talk

Tuesday, March 19, 2013, 15:45–16:00, E 001

Impact of inhomogeneities on antiferromagnetism in cold atom systems — •Elena Gorelik and Nils Blümer — Institute of Physics, Johannes Gutenberg University, Mainz, Germany

The study of inhomogeneities in antiferromagnets (AF) is of considerable interest both in condensed matter physics and in the cold-atom context. In atomic clouds, the intrinsic inhomogeneity is due to the presence of a confinement potential, whereas in material context interfaces provide an example of the large-scale inhomogeneities. Localized inhomogeneities, in particular impurities, in both homogeneous and spacially variable background, play important role in the interplay of competing phases.

We employ the real-space extension of dynamical mean-field theory (RDMFT) combined with Hirsch-Fye quantum Monte Carlo (QMC) impurity solver [1,2] to explore the effect of single/multiple impurities on the formation of AF correlations. Both the dimensional aspects and the proximity effects are analyzed. In d=2, RDMFT results are compared with those of direct calculations using the determinantal quantum Monte Carlo method.

[1] E. V. Gorelik, I. Titvinidze, W. Hofstetter, M. Snoek, and N. Blümer, Phys. Rev. Lett. 105, 065301 (2010).

[2] N. Blümer and E. V. Gorelik, Comp. Phys. Comm. 182, 115 (2011).