Study of the ionic Peierls-Hubbard model using density matrix renormalization group methods

Details Study of the ionic Peierls-Hubbard model using density matrix renormalization group methods Study of the ionic Peierls-Hubbard model using density matrix renormalization group methods

2004-01-27

arxiv.org/abs/cond-mat/0401535v2

Phys. Rev. B 72,125126 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.72.125126

Density matrix renormalization group methods are used to investigate the quantum phase diagram of a one-dimensional half-filled ionic Hubbard model with bond-charge attraction, which can be mapped from the Su-Schrieffer-Heeger-type electron-phonon coupling at the antiadiabatic limit. A bond order wave (dimerized) phase which separates the band insulator from the Mott insulator always exists as long as electron-phonon coupling is present. This is qualitatively different from that at the adiabatic limit. Our results indicate that electron-electron interaction, ionic potential and quantum phonon fluctuations combine in the formation of the bond-order wave phase.

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