Exact solution of a repulsive fermi model with enhanced superconducting correlations
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.
Krishnamurthy
HR
Department of Physics, Indian Institute of Science, Bangalore 560012, India.
Shastry
BS