Imperfect nesting and Peierls instability for a two-dimensional tight-binding model

Details Imperfect nesting and Peierls instability for a two-dimensional tight-binding model Imperfect nesting and Peierls instability for a two-dimensional tight-binding model

2001-01-10

arxiv.org/abs/cond-mat/0101147v1

Eur. Phys. J. B 22, 37 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 10 eps figures

Scientific paper

10.1007/PL00011133

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 $(\pi, \pi)$ 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.

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