Imperfect nesting and Peierls instability for a two-dimensional tight-binding model |
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Authors: | Q. Yuan T. Nunner T. Kopp |
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Affiliation: | Experimentalphysik VI, Universit?t Augsburg, 86135, Augsburg, Germany
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Abstract: | Based on a half-filled two-dimensional tight-binding model with nearest-neighbour and next nearest-neighbour hopping the effect of imperfect Fermi surface nesting on the Peierls instability is studied at zero temperature. Two dimerization patterns corresponding to a phonon vector (π,π) are considered. It is found that the Peierls instability will be suppressed with an increase of next nearest-neighbour hopping which characterizes the nesting deviation. First and second order transitions to a homogeneous state are possible. The competition between the two dimerized states is discussed. Received 22 December 2000 |
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Keywords: | PACS. 71.45.Lr Charge-density-wave systems – 63.20.Kr Phonon-electron and phonon-phonon interactions |
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