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TT: Tiefe Temperaturen

TT 28: Correlated Electrons: General Theory

TT 28.6: Vortrag

Donnerstag, 30. März 2006, 11:15–11:30, HSZ 301

Momentum-resolved spectral functions of SrVO₃ calculated by LDA+DMFT — •M. Kollar¹, I. A. Nekrasov^2,1, K. Held³, G. Keller¹, D. E. Kondakov⁴, Th. Pruschke⁵, O. K. Andersen³, V. I. Anisimov⁴, and D. Vollhardt¹ — ¹Theoretical Physics III, University of Augsburg — ²Institute for Electrophysics, Ekaterinburg, Russia — ³MPI for Solid State Research, Stuttgart — ⁴Institute of Metal Physics, Ekaterinburg, Russia — ⁵Institute for Theoretical Physics, University of Göttingen

We have calculated momentum-resolved spectral functions of SrVO₃ using LDA+DMFT [1]. To this end, we have employed Nth order muffin-tin (NMTO) downfolding to set up an effective low-energy Hamiltonian with three t_2g orbitals. This effective Hamiltonian was solved by DMFT. Our results for momentum-dependent spectra show renormalized quasiparticle bands over a broad energy range from -0.7 eV to +0.9 eV with small “kinks” discernible in the dispersion below the Fermi energy. A similar feature was also found recently in angle-resolved photoemission experiments [2].

[1] I. A. Nekrasov et al., cond-mat/0508313.

[2] T. Yoshida et al., cond-mat/0504075.