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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.17: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Excitonic instability in Two-Band Hubbard Model — •Pavel Augustinsky and Jan Kunes — Institute of Physics, ASCR, Prague, Czech Republic

We report a newly observed instability in the two-band Hubbard model close to the spin-state transition [1]. Using unbiased search for the particle-hole instabilities in DMFT, we found that the earlier observed high-spin low-spin checker-board order is competing with the excitonic phase characterized by condensed spinful excitons. We present both numerical results and an analytic description in the strong-coupling limit.
arXiv:1310.0669