Drag suppression in anomalous chiral media

TL;DR

This paper demonstrates that in anomalous chiral media under strong magnetic fields, heavy impurities experience no drag when moving along the magnetic field, due to the non-dissipative chiral magnetic effect, akin to superfluidity.

Contribution

The study generalizes Landau's criterion to anomalous chiral media, showing that the anomalous component does not contribute to drag, revealing frictionless impurity motion in such systems.

Findings

Impurity experiences no drag in anomalous chiral media under magnetic fields.

The non-dissipative current from the chiral magnetic effect causes frictionless impurity motion.

Results confirmed in both weakly coupled and strongly interacting chiral systems.

Abstract

We study a heavy impurity moving longitudinal with the direction of an external magnetic field in an anomalous chiral medium. Such system would carry a non-dissipative current of chiral magnetic effect associated with the anomaly. We show, by generalizing Landau's criterion for superfluidity, that the "anomalous component" which gives rise to the anomalous transport will {\it not} contribute to the drag experienced by an impurity. We argue on a very general basis that those systems with a strong magnetic field would exhibit an interesting transport phenomenon -- the motion of the heavy impurity is frictionless, in analogy to the case of a superfluid. We demonstrate and confirm our general results with two complementary examples: weakly coupled chiral fermion gases and strongly interacting chiral liquids.