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- W2000667925 abstract "Exciton condensation in a two-band Hubbard model on a square lattice is studied with variational Monte Carlo method. We show that the phase transition from an excitonic insulator to a band insulator is induced by increasing the interband Coulomb interaction. To examine the character of the exciton condensation, the exciton pair amplitudes both in $bm{k}$-space and in real space are calculated. Using these quantities, we discuss the BCS-BEC crossover within the excitonic insulator phase." @default.
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- W2000667925 date "2015-03-18" @default.
- W2000667925 modified "2023-09-25" @default.
- W2000667925 title "A variational Monte Carlo study of exciton condensation" @default.
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- W2000667925 doi "https://doi.org/10.1088/1742-6596/592/1/012097" @default.
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