Eur. Phys. J. B 22, 37-42 (2001)
https://doi.org/10.1007/PL00011133

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

¹ Experimentalphysik VI, Universität Augsburg, 86135 Augsburg, Germany
² Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, PR China

Corresponding author: ^a qingshan.yuan@physik.uni-augsburg.de

Received: 22 December 2000
Published online: 15 July 2001

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.