Orbitropic Effect in Superfluid $^3$He B-phase boundaries

TL;DR

This paper investigates how orbital viscosity affects the dynamics of the order parameter texture at superfluid $^3$He B-phase boundaries, introducing a model that predicts interface effective mass and friction mechanisms.

Contribution

It develops a novel model linking orbital viscosity to boundary dynamics, providing new insights into interface effective mass and friction in superfluid $^3$He B-phase.

Findings

Model predicts significant effective mass on the boundary.

The model explains friction via quasiparticle redistribution.

Predictions align with existing experimental data.

Abstract

In this work we study the influence of orbital viscosity on the dynamics of the order parameter texture in the superfluid B-phase of $^3$He near a moving bounda ry. Based on the redistribution of thermal quasiparticles within the texture, we develop a model which bestows a significant effective mass on the interface, an d gives a new mechanism for friction as the boundary moves. We have tested the model against existing data of a moving A-B interface whose motion was controlled using magnetic field. The model allows some predictions in experimental situations which involve texture rearrangement due to the B-phase boundary motion.