Josephson effect in superfluid atomic Fermi gases at finite temperature

By using Green's function method and linear response theory the Josephson effect of neutral fermions at finite temperature is investigated. Four different hyperfine states of the atoms are assumed to be trapped and to form two superfluids via the BCS-type of pairing. The Josephson effect can be realized by coupling the superfluids with two laser fields. The laser interaction is assumed to be a small perturbation and its effect is calculated using linear response theory. Both, single particle tunneling and the Josephson current, at finite temperature are calculated in Matsubara formalism.

Graphical abstractBy using Green's function method and linear response theory the Josephson effect of neutral fermions at finite temperature is investigated. Four different hyperfine states of the atoms are assumed to be trapped and to form two superfluids via the BCS-type of pairing. The Josephson effect can be realized by coupling the superfluids with two laser fields. The laser interaction is assumed to be a small perturbation and its effect is calculated using linear response theory. Both, single particle tunneling and the Josephson current, at finite temperature are calculated in Matsubara formalism.Figure optionsDownload full-size imageDownload as PowerPoint slide