AB interface in superfluid 3He and Casimir effect
G.E. Volovik
TL;DR
This paper investigates the friction force at the interface between two vacuum states of superfluid 3He at low temperatures, highlighting the role of Andreev reflection of fermions and its analogy to the Casimir effect.
Contribution
It introduces a model for the friction force in superfluid 3He interfaces based on Andreev reflection, drawing parallels to quantum vacuum phenomena.
Findings
Friction is dominated by Andreev reflection of fermions.
The results are analogous to a moving mirror in quantum vacuum.
Low-temperature behavior of the interface friction is characterized.
Abstract
The friction force on the moving interface between two different vacuum states of superfluid 3He is considered at low temperature. Since the dominating mechanism of the friction is the Andreev reflection of the massless "relativistic" fermions, which live on the A-phase side of the interface, the results are similar to that for the perfectly reflecting mirror moving in the quantum vacuum.
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