Nature of the Peierls- to Mott-insulator transition in 1D |
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| Authors: | H. Fehske A.P. Kampf M. Sekania G. Wellein |
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| Affiliation: | 1.Institut für Physik, Ernst-Moritz-Arndt Universit?t Greifswald, 17487 Greifswald, Germany,DE;2.Institut für Physik, Theoretische Physik III, Universit?t Augsburg, 86135 Augsburg, Germany,DE;3.RRZE, Universit?t Erlangen, 91058 Erlangen, Germany,DE |
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| 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. Received 7 July 2002 / Received in final form 21 October 2002 Published online 27 January 2003 RID="a" ID="a"e-mail: holger.fehske@physik.uni-greifswald.de |
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| Keywords: | 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 |
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