Phase diagram of exciton condensate in doped two-band Hubbard model

Jan Kuneš
Phys. Rev. B 90, 235140 – Published 22 December 2014

Abstract

Using the dynamical mean-field approximation we investigate the formation of excitonic condensate in the two-band Hubbard model in the vicinity of the spin-state transition. With temperature and band filling as the control parameters we realize all symmetry allowed spin-triplet excitonic phases, some exhibiting a ferromagnetic polarization. While the transitions are first order at low temperatures, at elevated temperatures continuous transitions are found that give rise to a multicritical point. Rapid but continuous transition between ferromagnetic and nonmagnetic excitonic phases allows switching of uniform magnetization by small changes of chemical potential.

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  • Received 21 October 2014
  • Revised 12 December 2014

DOI:https://doi.org/10.1103/PhysRevB.90.235140

©2014 American Physical Society

Authors & Affiliations

Jan Kuneš*

  • Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 53 Praha 6, Czech Republic

  • *kunes@fzu.cz

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Issue

Vol. 90, Iss. 23 — 15 December 2014

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