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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.67: Poster

Donnerstag, 17. März 2011, 10:00–13:00, P1

Band renormalization for systems on anisotropic triangular lattices — •Andrea Di Ciolo, Luca F. Tocchio, and Claudius Gros — Institut fuer Theoretische Physik, Goethe Universitaet Frankfurt, Frankfurt Am Main, Germany.

We consider electronic systems on anisotropic triangular lattices, i.e. with hopping t on two bonds of the unit cell and t' on the last bond.

We apply the renormalized mean-field theory to the Hubbard model [see F. C. Zhang, et al., Supercond. Sci. Tech. 1, 36 (1988)] and our analytical results are to be compared with Variational Monte Carlo findings.

The renormalization of the band structure and the evolution of the Fermi surface are investigated as due to electronic correlations.

In particular, motivated by former studies for 2D-systems on square lattices [C. Gros et al., Proc. Natl. Acad. Sci. U.S.A. 103, 14928 (2006)] and 1D-systems [L. F. Tocchio et al., Phys. Rev. B 81, 205109 (2010)], we explore the issue of the underlying Fermi surface (Luttinger surface) for insulating states on triangular lattices.