Caprara, S. ; Avignon, M. ; Sarma, D. D. (1997) Spin and charge density waves in the extended hubbard model: a slave boson approach International Journal of Modern Physics B, 11 (17). pp. 2057-2074. ISSN 0217-9792
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Official URL: http://www.worldscinet.com/ijmpb/11/1117/S02179792...
Related URL: http://dx.doi.org/10.1142/S0217979297001064
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: | Article |
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Source: | Copyright of this article belongs to World Scientific Publishing Company. |
ID Code: | 46409 |
Deposited On: | 04 Jul 2011 11:52 |
Last Modified: | 04 Jul 2011 11:52 |
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