0439226 - FZÚ 2015 RIV US eng J - Článek v odborném periodiku
Kuneš, Jan
Phase diagram of exciton condensate in doped two-band Hubbard model.
Physical Review. B. Roč. 90, č. 23 (2014), "235140-1"-"235140-8". ISSN 1098-0121. E-ISSN 2469-9969
Grant CEP: GA ČR GA13-25251S
Institucionální podpora: RVO:68378271
Klíčová slova: Hubbard model * spin-state transition * semiconductor-semimetal transition
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 3.736, rok: 2014 ; AIS: 1.331, rok: 2014
DOI: https://doi.org/10.1103/PhysRevB.90.235140

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.
Trvalý link: http://hdl.handle.net/11104/0242542