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Detect Axial Gauge Fields with a Calorimeter

Abstract : Torsional strain in Weyl semimetals excites a unidirectional chiral density wave propagating in the direction of the torsional vector. This gapless excitation, named the chiral sound wave, is generated by a particular realization of the axial anomaly via the triple-axial (AAA) anomalous diagram. We show that the presence of the torsion-generated chiral sound leads to a linear behavior of the specific heat of a Weyl semimetal and to an enhancement of the thermal conductivty at experimentally accessible temperatures. We also demonstrate that such an elastic twist lowers the temperature of the sample, thus generating a new, anomalous type of elasto-calorific effect. Measurements of these thermodynamical effects will provide experimental verification of the exotic triple-axial anomaly as well as the reality of the elastic pseudomagnetic fields in Weyl semimetals.
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Matteo Baggioli, Maxim N. Chernodub, Karl Landsteiner, María A.H. Vozmediano. Detect Axial Gauge Fields with a Calorimeter. SciPost Phys.Core, 2020, 3, pp.013. ⟨10.21468/SciPostPhysCore.3.2.013⟩. ⟨hal-02550024⟩

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