Advertisement

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

  • H. Fehske
  • A.P. Kampf
  • M. Sekania
  • G. Wellein

Abstract:

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 a narrow intermediate phase with finite spin, charge, and optical excitation gaps.

PACS. 71.10.Hf Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems – 71.10.Fd Lattice fermion models (Hubbard model, etc.) – 71.45.Lr Charge-density-wave systems – 71.30.+h Metal-insulator transitions and other electronic transitions 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© EDP Sciences, Springer-Verlag 2003

Authors and Affiliations

  • H. Fehske
    • 1
  • A.P. Kampf
    • 2
  • M. Sekania
    • 2
  • G. Wellein
    • 3
  1. 1.Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, GermanyDE
  2. 2.Institut für Physik, Theoretische Physik III, Universität Augsburg, 86135 Augsburg, GermanyDE
  3. 3.RRZE, Universität Erlangen, 91058 Erlangen, GermanyDE

Personalised recommendations