Kazumitsu Sakai and Andreas Klümper 2001 J. Phys. A: Math. Gen. 34 8015 doi:10.1088/0305-4470/34/39/307
Finite-temperature correlations for the Uq(
(2|1))-invariant generalized Hubbard model
Kazumitsu Sakai and Andreas Klümper
Show affiliations We study an integrable model of one-dimensional strongly correlated electrons at finite temperature by explicit calculation of the correlation lengths of various correlation functions. The model is invariant with respect to the quantum superalgebra Uq((2|1)) and characterized by the Hubbard interaction, correlated hopping and pair-hopping terms. Using the integrability, the graded quantum transfer matrix is constructed. From the analyticity of its eigenvalues, a closed set of nonlinear integral equations is derived which describe the thermodynamical quantities and the finite-temperature correlations. The results show a crossover from a regime with dominating density-density correlations to a regime with dominating superconducting pair correlations. Analytical calculations in the low-temperature limit are also discussed.
- PACS
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71.27.+a Strongly correlated electron systems; heavy fermions
- MSC
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35Q58 Other completely integrable equations (See also 37J35, 37K10)
- Subjects
- Dates
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Issue 39 (5 October 2001)
Received 24 May 2001
Published 21 September 2001
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Finite-temperature correlations for the Uq((2|1))-invariant generalized Hubbard model
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