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- W2006583945 abstract "We investigate the ground state phase diagram of the half-filled $t-t^{prime}$ repulsive Hubbard model in the presence of a staggered ionic potential $Delta$, using the continuum-limit bosonization approach. We find, that with increasing on-site-repulsion $U$, depending on the value of the next-nearest-hopping amplitude $t^{prime}$, the model shows three different versions of the ground state phase diagram. For $t^{prime} < t^{prime}_{ast}$, the ground state phase diagram consists of the following three insulating phases: Band-Insulator at $U<U_{c}$, Ferroelectric Insulator at $U_{c} < U < U_{s}$ and correlated (Mott) Insulator at $U > U_{c}$. For $t^{prime} > t^{prime}_{c}$ there is only one transition from a spin gapped metallic phase at $U<U_{c}$ to a ferroelectric insulator at $U > U_{c}$. Finally, for intermediate values of the next-nearest-hopping amplitude $t^{prime}_{ast} < t^{prime} < t^{prime}_{c}$ we find that with increasing on-site repulsion, at $U_{c1}$ the model undergoes a second-order commensurate-incommensurate type transition from a band insulator into a metallic state and at larger $U_{c2}$ there is a Kosterlitz-Thouless type transition from a metal into a ferroelectric insulator." @default.
- W2006583945 created "2016-06-24" @default.
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- W2006583945 date "2007-06-22" @default.
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- W2006583945 title "Band-insulator–metal–Mott-insulator transition in the half-filled<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>t</mml:mi><mml:mtext>−</mml:mtext><mml:msup><mml:mi>t</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:mrow></mml:math>ionic Hubbard chain" @default.
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- W2006583945 doi "https://doi.org/10.1103/physrevb.75.245122" @default.
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