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TT: Fachverband Tiefe Temperaturen

TT 32: Superconductivity: Theory 2

TT 32.3: Vortrag

Mittwoch, 18. März 2020, 10:00–10:15, HSZ 103

Communal pairing in spin-imbalanced Fermi gases — •Darryl Foo — University of Cambridge

A spin-imbalanced Fermi gas with an attractive contact interaction forms a superconducting state whose underlying components are superpositions of Cooper pairs that share minority-spin fermions. This superconducting state includes correlations between all available fermions, making it energetically favorable to the Fulde-Ferrell-Larkin-Ovchinnikov superconducting state. The ratio of the number of up- and down-spin fermions in the instability is set by the ratio of the up- and down-spin density of states in momentum at the Fermi surfaces, to fully utilize the accessible fermions. We present analytical [EPL 126 67003 (2019)] and complementary Diffusion Monte Carlo results [arXiv:1910.13582] for the state.