Local symmetry and impossibility of mixed valence in the Falicov-Kimball model

Subrahmanyam, V. ; Barma, M. (1988) Local symmetry and impossibility of mixed valence in the Falicov-Kimball model Journal of Physics C: Solid State Physics, 21 (2). L19-L22. ISSN 0022-3719

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Official URL: http://iopscience.iop.org/0022-3719/21/2/002

Related URL: http://dx.doi.org/10.1088/0022-3719/21/2/002

Abstract

It is pointed out that homogeneously mixed-valent and excitonic insulator phases proposed earlier for the Falicov-Kimball model break a local symmetry of the Hamiltonian. An Elitzur-type proof on the impossibility of spontaneously breaking a local symmetry is given to show that such phases are not possible at nonzero temperature. At zero temperature, the possibility of breaking a local symmetry is demonstrated in a related model, but it is argued that such symmetry breaking does not occur in the Falicov-Kimball model.

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Deposited On:27 Jan 2012 12:57
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