On Quartet Superfluidity of Fermionic Atomic Gas

TL;DR

This paper explores the theoretical possibility of a new type of superfluidity involving four-fermion pairing in ultra-cold atomic gases, highlighting conditions like hyperfine degeneracy and moderate coupling.

Contribution

It introduces the concept of quartet superfluidity in fermionic gases and discusses potential realization in electron systems, expanding understanding of superfluid phases.

Findings

Quartet superfluidity requires four-fold hyperfine degeneracy.

Moderate coupling is essential for quartet formation.

Potential for quartet superconductivity in electron systems.

Abstract

Possibility of a quartet superfluidity in fermionic systems is studied as a new aspect of atomic gas at ultra low temperatures. The four-fold degeneracy of hyperfine state and moderate coupling is indispensable for the quartet superfluidity to occur. Possible superconductivity with quartet condensation in electron systems is discussed.