Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 15: Correlated Electrons: Metal-Insulator Transition 2

TT 15.8: Talk

Tuesday, March 24, 2009, 11:30–11:45, HSZ 301

Mott transitions in the repulsive SU(3) invariant Hubbard model — •Elena Gorelik and Nils Blümer — Institut für Physik, Universität Mainz, Mainz, Germany

Ultracold fermions on optical lattices are nowadays one of the most exciting fields of both experimental and theoretical studies. They are often considered as model systems for simulating complex condensed matter phenomena. On the other hand, fermionic atoms have large hyperfine multiplets, out of which several states can be trapped simultaneously, leading to new degrees of freedom that are unavailable in solid state physics. This feature has attracted a lot of attention as an origin of possible exotic superfluid states in the case of an attractive on-site interaction [1,2].

Here we focus on another important phenomenon that has not yet been addressed within the multiflavor context - the Mott transition in the repulsive case, both as a function of the local interaction U and of the chemical potential. We present the results of a DMFT study, using the multigrid Hirsch-Fye quantum Monte-Carlo impurity solver [3], for the repulsive three flavor fermionic system. The peculiarities and experimentally accessible signatures of Mott transitions in such a multiflavor system are discussed in comparison with the two flavor/spin case.

[1] Á. Rapp et al., Phys. Rev. Lett. 98, 160405 (2007).

[2] R. W. Cherng et al., Phys. Rev. Lett. 99, 130406 (2007).

[3] N. Blümer, arXiv:0801.1222 (2008).