Nature of the Peierls- to Mott-insulator transition in 1D

Details Nature of the Peierls- to Mott-insulator transition in 1D Nature of the Peierls- to Mott-insulator transition in 1D

2002-03-29

arxiv.org/abs/cond-mat/0203616v2

Eur. Phys. J. B 31, 11-16 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 7 figures to appear in EPJB

Scientific paper

10.1140/epjb/e2003-00002-2

In order to clarify the physics of the crossover from a Peierls band insulator to a correlated Mott-Hubbard insulator, we analyze ground-state and spectral properties of the one-dimensional half-filled Holstein-Hubbard model using quasi-exact numerical techniques. In the adiabatic limit the transition is connected to the band to Mott insulator transition of the ionic Hubbard model. Depending on the strengths of the electron-phonon coupling and the Hubbard interaction the transition is either first order or evolves continuously across an intermediate phase with finite spin, charge, and optical excitation gaps.

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