Abstract
We study the effect of strong electronic correlations in the presence of chemically-induced charge transfer. We consider the Hubbard model at half-filling with an external staggered field as the simplest model to investigate the condition for the existence of a spin density wave competing with a charge density wave. The slave-boson approach is used to treat the electronic correlations in the strong coupling regime. We also consider the effect of a Brillouin-zone boundary phonon via a dimerization of the hopping term, thus introducing a competition with a paramagnetic bond-alternating phase and determine the phase diagram.
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References
S. Caprara, M. Avignon, and O. Navarro, unpublished.
A similar model, where however the direct effect of U on the charge-density-wave amplitude was prevented by subtracting the Hartree contribution in the U term, was studied in V. Tugushev, S. Caprara, and M. Avignon, Phys. Rev. B 54 5466 (1996).
S. E. Barnes, J. Phys. F 6, 1375 (1976); P. Coleman, Phys. Rev. B 29, 3035 (1984).
G. Kotliar and A. R. Ruckenstein, Phys. Rev. Lett. 57, 1362 (1986);we refer to this paper for any detail about the SB technique on a bipartite lattice.
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© 1998 Springer Science+Business Media New York
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Caprara, S., Avignon, M., Navarro, O. (1998). Spin Density Waves in Dimerized Systems. In: Morán-López, J.L. (eds) Current Problems in Condensed Matter. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9924-8_4
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DOI: https://doi.org/10.1007/978-1-4757-9924-8_4
Publisher Name: Springer, Boston, MA
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