Kohn-Luttinger instability of the t-t' Hubbard model in two dimensions: variational approach

Details Kohn-Luttinger instability of the t-t' Hubbard model in two dimensions: variational approach Kohn-Luttinger instability of the t-t' Hubbard model in two dimensions: variational approach

2002-12-09

arxiv.org/abs/cond-mat/0212176v1

Physics

Condensed Matter

Scientific paper

10.1103/PhysRevB.67.174518

An effective Hamiltonian for the Kohn-Luttinger superconductor is constructed and solved in the BCS approximation. The method is applied to the t-t' Hubbard model in two dimensions with the following results: (i) The superconducting phase diagram at half filling is shown to provide a weak-coupling analog of the recently proposed spin liquid state in the J_1-J_2 Heisenberg model. (ii) In the parameter region relevant for the cuprates we have found a nontrivial energy dependence of the gap function in the dominant d-wave pairing sector. The hot spot effect in the angular dependence of the superconducting gap is shown to be quite weak.

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