Perturbation theory about generalized self-consistent field solution

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Title:	Perturbation theory about generalized self-consistent field solution
Authors:	Yang, C.;Kocharian, A.N.;Chiang, Y.L.;Chen, L.Y.
Contributors:	物理學系
Date:	2005
Issue Date:	2009-10-30 14:43:55 (UTC+8)
Abstract:	A new efficient converging perturbation technique valid for arbitrary interaction strength U/t and electron concentration n is applied to study strongly correlated electrons within the repulsive Hubbard model. We test the new perturbation expansion theory in terms of interacting quasi-particles about generalized self-consistent field (GSCF) solution in an entire parameter space. The developed perturbation formalism for strong interaction and large perturbation region differs from the traditional theory on the vicinity of non-interacting electrons by incorporating systematically fluctuations of quasi-particles around self-consistent solution. Performed analytical calculations of the ground state properties in the extreme conditions of one dimensionality provide quite reasonable numerical agreement with the Bethe-ansatz results in the intermediate range of U/t and n. The results are compared with the predictions of traditional perturbation theory.
Relation:	INTERNATIONAL JOURNAL OF MODERN PHYSICS B v.19 n.14 Pages: 2225-2249
Appears in Collections:	[Department of Physics ] journal articles

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