Exact Solution of a Repulsive Fermi Model with Enhanced Superconducting Correlations
H. R. Krishnamurthy, B. Sriram Shastry
DOI 10.1103/PhysRevLett.84.4918 · Physical Review Letters
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Abstract
We present the exact solution of a model of interacting fermions in any dimension with a pure repulsive interaction projecting out a given Cooper channel. The solution rests upon the infinite ranged character of the interaction in real space, leading to a functional integral that is dominated by a Gaussian term. The solution produces strong superconducting enhancements and quasi-long-ranged order in a channel that is not present in the Hamiltonian explicitly, but of the form given by arguments from order by projection.
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