Coexistence of bond-order wave and antiferromagnetism in a two-dimensional half-filled Peierls-Hubbard model

Abstract

The two-dimensional Peierls-Hubbard model is studied at half-filling within both Hartree-Fork and Kotliar-Ruckenstein slave-boson theory. The interplay between two types of long-range order, bond-order wave (BOW) and antiferromagnetism (AFM), is analysed for two representative dimerization patterns, corresponding both to the same wavevector $(\pi ,\pi )$. For each pattern, the Peierls dimerization (and associated BOW) is weakened and finally suppressed with increasing Hubbard on-site interaction, and correspondingly AFM is gradually enhanced. In particular, a coexistence regime with both BOW and AFM order is established in the parameter space of electron-lattice and Hubbard interactions.

19 pages with 5 eps figures included

References in corpus (1)

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

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