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TT: Fachverband Tiefe Temperaturen

TT 83: Superconductivity: (General) Theory

TT 83.8: Talk

Thursday, March 15, 2018, 11:30–11:45, HFT-FT 101

Multi-particle theory of superconductivity — •Gareth Conduit and Thomas Whitehead — Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom

A spin-imbalanced Fermi gas with an attractive contact interaction forms a superconducting state whose underlying components are multi-particle instabilities, each involving more than two fermions. This multi-particle superconducting state is energetically favourable to Fulde-Ferrell-Larkin-Ovchinnikov superconductivity, because it includes correlations between all available fermions. The ratio of the number of up- and down-spin fermions in the instability is a function of the ratio of the up- and down-spin densities of states in momentum at the Fermi surfaces, to fully utilise the accessible fermions.