Enhanced Superconductivity in Quasi Two-Dimensional Systems

J. E. Hirsch; D. J. Scalapino

doi:10.1103/PhysRevLett.56.2732

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Enhanced Superconductivity in Quasi Two-Dimensional Systems

J. E. Hirsch, D. J. Scalapino

DOI 10.1103/PhysRevLett.56.2732 · Physical Review Letters

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Abstract

We show that the tendency for superconductivity of a weakly coupled 2D electron system can be significantly enhanced if the Fermi energy is close to a logarithmic Van Hove singularity in the density of states. Using results from perturbation theory, supported by quantum Monte Carlo simulations, we calculate Tc and explore the effects of the quasiparticle lifetime and higher-order interactions on this enhancement. This mechanism suggests possible new directions in the search for 2D excitonic superconductivity.