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- W2043619134 abstract "We derive an effective Hamiltonian $H_{eff}$ for an ionic Hubbard chain, valid for $tll U,Delta $, where $t$ is the hopping, $U$ the Coulomb repulsion, and $Delta$ the charge transfer energy. $H_{eff}$ is the minimal model for describing the transition from the band insulator (BI) ($Delta -Ugg t$) and the Mott insulator (MI) ($U-Delta gg t$). Using spin-particle transformations (Phys. Rev. Lett. textbf{86}, 1082 (2001)), we map $H_{eff}(U=Delta)$ into an SU(3) antiferromagnetic Heisenberg model whose exact ground state is known. In this way, we show rigorously that a spontaneously dimerized insulating ferroelectric phase appears in the transition region between the BI and MI." @default.
- W2043619134 created "2016-06-24" @default.
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- W2043619134 date "2004-06-18" @default.
- W2043619134 modified "2023-10-10" @default.
- W2043619134 title "Exact Bond Ordered Ground State for the Transition between the Band and the Mott Insulator" @default.
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- W2043619134 doi "https://doi.org/10.1103/physrevlett.92.246405" @default.
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