Temperature dependence of the order parameter of the polar phase of liquid 3He in nematic aerogel

TL;DR

This paper demonstrates that in the polar phase of superfluid 3He within nematic aerogel, the temperature dependence of the energy gap matches that of the bulk phase, akin to the Anderson theorem in superconductors.

Contribution

It reveals that under specular reflection conditions, the polar phase's energy gap temperature dependence remains unaffected by impurities, extending the Anderson theorem analogy.

Findings

Energy gap temperature dependence matches bulk polar phase

Specular reflection preserves gap behavior

Impurities do not alter the gap in this regime

Abstract

It is shown that in the polar phase of superfluid 3 He, stabilized by nematic aerogel, at the condition of specular reflection of quasi-particles from the strands of aerogel the temperature dependence of the gap in the spectrum of quasi-particles coincides with that in the bulk polar phase without impurities. The analogy with the Anderson theorem for conventional superconductors is discussed.