Wiedemann–Franz behavior at the Weyl points in compressively strained HgTe

Abu Alex Aravindnath (), Yi-Ju Ho, Fabian Schmitt, Dongyun Chen, Johannes Kleinlein, Wouter Beugeling, Hartmut Buhmann, Stanislau U. Piatrusha () and Laurens W. Molenkamp ()
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Abu Alex Aravindnath: Universität Würzburg, Physikalisches Institut (EP3)
Yi-Ju Ho: Universität Würzburg, Physikalisches Institut (EP3)
Fabian Schmitt: Universität Würzburg, Physikalisches Institut (EP3)
Dongyun Chen: Universität Würzburg, Physikalisches Institut (EP3)
Johannes Kleinlein: Universität Würzburg, Physikalisches Institut (EP3)
Wouter Beugeling: Universität Würzburg, Physikalisches Institut (EP3)
Hartmut Buhmann: Universität Würzburg, Physikalisches Institut (EP3)
Stanislau U. Piatrusha: Universität Würzburg, Physikalisches Institut (EP3)
Laurens W. Molenkamp: Universität Würzburg, Physikalisches Institut (EP3)

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Weyl semimetals, with their unique electronic band structure, have drawn significant interest for their potential to explore quantum anomalies in condensed matter systems. In this study, we investigate the large positive magneto-thermal conductance associated with the gravitational anomaly – one of the predicted anomalies – for a Weyl semimetal based on a compressively strained HgTe layer. We clearly identify the Weyl regime in our device and accurately extract the thermal conductance by performing thermometry measurements at liquid helium temperatures using fully electronic methods. We observe the anticipated increase in thermal conductance, and it perfectly matches the electrical conductance according to the Wiedemann–Franz law. This finding indicates that, despite the unique electronic spectrum of Weyl semimetals, the mechanism governing heat transport in this system is the same as that for electrical transport, with no additional violations of conservation laws.

Date: 2025
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DOI: 10.1038/s41467-025-66909-z

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