Stabilized Pair Density Wave via Nanoscale Confinement of Superfluid 3He

Superfluid 3He under nanoscale confinement has generated significant interest due to the rich spectrum of phases with complex order parameters that may be stabilized. Experiments have uncovered a variety of interesting phenomena, but a complete picture of superfluid 3He under confinement has remained elusive. Here, we present phase diagrams of superfluid 3He under varying degrees of uniaxial confinement, over a wide range of pressures, which elucidate the progressive stability of both the A phase, as well as a growing region of stable pair density wave state.