Volume 126, Number 6, June 2019
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 July 2019|
Communal pairing in spin-imbalanced Fermi gases
Cavendish Laboratory - J.J. Thomson Avenue, Cambridge, CB3 0HE, UK
Received: 24 October 2018
Accepted: 18 June 2019
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 and complementary Diffusion Monte Carlo results for the state.
PACS: 74.20.Mn – Nonconventional mechanisms / 02.70.Ss – Quantum Monte Carlo methods / 67.85.Lm – Degenerate Fermi gases
© EPLA, 2019
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