https://doi.org/10.1140/epjb/e2003-00002-2
Nature of the Peierls- to Mott-insulator transition in 1D
1
Institut für Physik, Ernst-Moritz-Arndt
Universität Greifswald, 17487 Greifswald, Germany
2
Institut für Physik, Theoretische Physik III,
Universität Augsburg,
86135 Augsburg, Germany
3
RRZE, Universität Erlangen, 91058 Erlangen, Germany
Corresponding author: a holger.fehske@physik.uni-greifswald.de
Received:
7
July
2002
Revised:
21
October
2002
Published online:
27
January
2003
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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
