Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Cold Atomic Gases

TT 7.5: Vortrag

Montag, 7. März 2016, 11:15–11:30, H18

DMFT + NRG study of the SU(N) Fermi-Hubbard model — •Seung-Sup B. Lee, Jan von Delft, and Andreas Weichselbaum — Physics Department, Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience, Ludwig-Maximilians-Universität München, 80333 München, Germany

The SU(N) Fermi-Hubbard model, involving N flavors of fermions that interact fully symmetrically, has recently gained experimental relevance in the context of ultracold Ytterbium atoms in optical lattice, where the value of N can be changed controllably up to N=6. The SU(2) Fermi-Hubbard model is well-known to exhibit a Mott metal-insulator transition, but a quantitative analysis of its SU(N)-symmetric counterpart has been limited so far to N ≤ 3 or half-filling. Here we study the Mott transition of SU(N) Fermi-Hubbard model (up to N=6) with dynamical mean-field theory (DMFT) using the numerical renormalization group (NRG) as impurity solver. By exploiting non-Abelian symmetry, the NRG yields the local spectral function efficiently with high spectral resolution over a wide range of system parameters, such as the interaction strength, chemical potential, and temperature.