Using the chiral anomaly to make a refrigerator

August 24, 2018

In a newly-published Rapid Communication, we have shown how the chiral anomaly in Weyl semimetals admits an analogue of "adiabatic demagnetization", which is a technique for low-temperature refrigeration. The idea is that abruptly turning on or off the chiral anomaly (by switching on/off parallel electric and magnetic fields) leads to an abrupt change in entropy, which is accompanied by flow of heat into or out of the system.

This effect may provide a crucial test for the existence of the chiral anomaly when transport probes are complicated by other magnetoresistance effects.