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  • 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.
  • 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. (en)
Title
  • Phase diagram of exciton condensate in doped two-band Hubbard model
  • Phase diagram of exciton condensate in doped two-band Hubbard model (en)
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  • Phase diagram of exciton condensate in doped two-band Hubbard model
  • Phase diagram of exciton condensate in doped two-band Hubbard model (en)
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  • RIV/68378271:_____/14:00439226!RIV15-GA0-68378271
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  • I, P(GA13-25251S)
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  • 23
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  • RIV/68378271:_____/14:00439226
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  • Hubbard model; spin-state transition; semiconductor-semimetal transition (en)
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  • US - Spojené státy americké
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  • [D77663406893]
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  • Physical Review. B
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  • 90
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  • Kuneš, Jan
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  • 000346825400007
issn
  • 1098-0121
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  • 10.1103/PhysRevB.90.235140
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