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Spin and charge density waves in the extended Hubbard model: A slave-boson approach

Caprara, S and Avignon, M and Sarma, DD (1997) Spin and charge density waves in the extended Hubbard model: A slave-boson approach. In: International Journal of Modern Physics B, 11 (17). pp. 2057-2074.

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Official URL: http://www.worldscinet.com/ijmpb/11/1117/S02179792...

Abstract

We use the extended Hubbard model to investigate the properties of the charge- and spin-density-wave phases in the presence of a nearest-neighbors repulsion term in the framework of the slave-boson technique. We show that, contrary to Hartree-Fock results, an instablity may occur for sufficiently high values of the Hubbard repulsion, both in the spin- and charge-density-wave phase, which makes the system discontinuously jump to a phase with a smaller or zero wave amplitude. The limits of applicability of our approach are discussed and our results are compared with previous numerical analysis. The phase diagram of the model at half-filling is determined.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to World Scientific Publishing Company.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Ms V Mangala
Date Deposited: 24 Jun 2011 07:18
Last Modified: 24 Jun 2011 07:18
URI: http://eprints.iisc.ac.in/id/eprint/38471

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