Fermionic Superfluidity with Imbalanced Spin Populations

Supporting Online Material for Fermionic Superfluidity with Imbalanced Spin Populations

Fermionic Superfluidity with Imbalanced Spin Populations and the Quantum Phase Transition to the Normal State

Whether it occurs in superconductors, helium-3 or inside a neutron star, fermionic superfluidity requires pairing of fermions, particles with half-integer spin. For an equal mixture of two states of fermions (”spin up” and ”spin down”), pairing can be complete and the entire system will become superfluid. When the two populations of fermions are unequal, not every particle can find a partner. W...

Nonlocal quantum fluctuations and fermionic superfluidity in the imbalanced attractive Hubbard model.

We study fermionic superfluidity in strongly anisotropic optical lattices with attractive interactions utilizing the cluster dynamical mean-field theory method, and focusing in particular on the role of nonlocal quantum fluctuations. We show that nonlocal quantum fluctuations impact the BCS superfluid transition dramatically. Moreover, we show that exotic superfluid states with a delicate order...

On Quartet Superfluidity of Fermionic Atomic Gas

The superfluidity is so far known to be sustained by the Bose-Einstein condensate or the Cooper-pair condensate. The former is realized in liquid He and some atomic gas of an alkali element, while the latter is realized in liquid He and a variety of superconductors. Recently, it has been found that Cooper pairs are formed in the fermionic atomic gas of alkali element and the crossover to the Bo...

Spin currents and spin superfluidity

The present review analyzes and compares various types of dissipationless spin transport: (1) Superfluid transport, when the spin-current state is a metastable state (a local but not the absolute minimum in the parameter space). (2) Ballistic spin transport, when spin is transported without losses simply because sources of dissipation are very weak. (3) Equilibrium spin currents, i.e., genuine ...