Abstract
We analyze the response of a two-dimensional superconductor to a magnetic field. We assume that the system can be described by an extended Hubbard model with an attractive nearest-neighbor pairing potential effective both in the singlet and the triplet channels. Treating the model Hamiltonian within the mean-field approximation, we study the competition at zero temperature between superconducting states characterized by different spin and spatial symmetries, as induced by electron density variations and by the explicit time-reversal symmetry breaking due to the presence of a magnetic field. We focus in particular on the competition between unitary and nonunitary states.
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