π–superconducting quantum interference device from ultracold fermionic atomic gases

Miodrag L. Kulić

doi:10.1103/PhysRevA.76.053625

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π–superconducting quantum interference device from ultracold fermionic atomic gases

Miodrag L. Kulić

DOI 10.1103/PhysRevA.76.053625 · Physical Review A

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Abstract

Ultracold fermionic atomic gas with Bardeen-Cooper-Schrieffer pairing between hyperfine states is studied. It is shown that a π-Josephson contact [superfluid–normal-gas–superfluid (S∕N∕S)] can be realized in systems where the left and right banks S are superfluids and the weak link N is a normal gas with the finite mismatch in chemical potentials δμN≠0. If such a π-junction is part of a closed superfluid ring the superfluid mass-current flows spontaneously—the ultracold atomic π–superconducting quantum interference device (π-SQUID). This situation is realized if the radius of the ring R is larger than the critical one Rc. The same effect will be realized also for δμN⪢Δ, where Δ is the superfluid gap in S. The sensitivity of the π-SQUID to inertial effects is discussed in the case of rotational motion.