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arXiv · 2608.25726

Observation of thermal Hall effect in diamond

Marcin Matusiak·Andrzej Ptok·Maria Szlawska·Kamran Behnia
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Abstract

Numerous insulators, including non-magnetic ones, have been unexpectedly found to display a finite thermal Hall signal, which has stimulated debate about its origin. Here, we report on a study of the thermal Hall effect in two diamond single crystals. The transverse thermal conductivity (kappa_xy) was found to peak at a temperature close to that at which the longitudinal thermal conductivity (kappa_xx) reaches its maximum. The measured kappa_xy, with an amplitude of 340 W/(m K) at B = 10 T, is the largest ever observed, while the kappa_xy/kappa_xx ratio follows the phenomenological trend identified in other insulators. Our observation implies the existence of an intrinsic thermal Hall effect in a generic phonon gas. We argue that the rough amplitude of both the thermal Hall angle and the thermal Hall resistivity can be accounted for by simple arguments invoking fundamental constants and quantum-mechanical constraints on solid state cohesion.

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Marcin Matusiak, Andrzej Ptok, Maria Szlawska, Kamran Behnia. 2026-08-26. Observation of thermal Hall effect in diamond. https://arxiv.org/abs/2608.25726

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