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Non-Fermi liquid behavior in a mean-field study of the t-J model: Role of zero-point spin fluctuations

Sarker, SK and Jayaprakash, C and Krishnamurthy, HR (1994) Non-Fermi liquid behavior in a mean-field study of the t-J model: Role of zero-point spin fluctuations. In: Physica C: Superconductivity, 228 (3-4). 309 -318 .

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Official URL: http://dx.doi.org/10.1016/0921-4534(94)90420-0

Abstract

We present analytic results to show that the Schwinger-boson hole-fermion mean-field state exhibits non-Fermi liquid behavior due to spin-charge separation. The physical electron Green's function consists of three additive components. (a) A Fermi-liquid component associated with the bose condensate. (b) A non-Fermi liquid component which has a logarithmic peak and a long tail that gives rise to a linear density of states that is symmetric about the Fermi level and a momentum distribution function with a logarithmic discontinuity at the Fermi surface. (c) A second non-Fermi liquid component associated with the thermal bosons which leads to a constant density of states. It is shown that zero-point fluctuations associated with the spin-degrees of freedom are responsible for the logarithmic instabilities and the restoration of particle-hole symmetry close to the Fermi surface.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier science.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 11 Apr 2011 13:11
Last Modified: 11 Apr 2011 13:11
URI: http://eprints.iisc.ernet.in/id/eprint/36653

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