The missing angular momentum of superconductors

TL;DR

The paper highlights a fundamental inconsistency in the conventional theory of superconductivity regarding angular momentum conservation during the Meissner effect and suggests that an unconventional theory may resolve this issue.

Contribution

It identifies a key unresolved problem in the London-BCS framework and proposes that the unconventional hole superconductivity theory offers a consistent explanation.

Findings

The Meissner effect challenges angular momentum conservation in conventional theory.

Unconventional hole superconductivity theory explains the Meissner effect without inconsistency.

The role of spin-orbit coupling and charge inhomogeneity is crucial in the new explanation.

Abstract

We point out that the Meissner effect, the process by which a superconductor expels magnetic field from its interior, represents an unsolved puzzle within the London-BCS theoretical framework used to describe the physics of conventional superconductors, because it appears to give rise to non-conservation of angular momentum. Possible ways to avoid this inconsistency within the conventional theory of superconductivity are argued to be farfetched. Consequently, we argue that unless/until a consistent explanation is put forth, the existence of the Meissner effect represents an anomaly that casts doubt on the validity of the conventional framework. Instead, we point out that two elements of the unconventional theory of hole superconductivity, namely that the charge distribution in superconductors is macroscopically inhomogeneous, and the fact that spin-orbit coupling plays an essential role, allow for a consistent explanation of the Meissner effect.