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- W2038932006 abstract "Excitonic phases described by the quantum condensation of electron-hole pairs (or excitons) are studied in the two-orbital Hubbard model with the Hund's rule coupling J. Using the variational cluster approximation, we calculate the ground-state energy and order parameters, and show that the Hund's rule coupling always stabilizes the excitonic spin-density- wave state and destabilizes the excitonic charge-density-wave state. The pair coherence lengths calculated in the spin-singlet and spin-triplet states indicate that only the spin-triplet excitons are paired more tightly with increasing J. The single-particle spectrum and density of states are also calculated to clarify the characters of these excitonic density-wave states." @default.
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- W2038932006 date "2015-03-18" @default.
- W2038932006 modified "2023-09-27" @default.
- W2038932006 title "Excitonic phases in the two-orbital Hubbard model: Roles of Hund's rule coupling" @default.
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