Berry curvature unravelled by the anomalous Nernst effect in Mn3 Ge

Wuttke C, Caglieris F, Sykora S, Scaravaggi F, Wolter AAUB, Manna K, Suess V, Shekhar C, Felser C, Buechner B, Hess C (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Physical Review B American Physical Society

Book Volume: 100

Article Number: 085111

Journal Issue: 8

DOI: 10.1103/PhysRevB.100.085111

Abstract

The discovery of topological quantum materials represents a striking innovation in modern condensed matter physics with remarkable fundamental and technological implications. Their classification has been recently extended to topological Weyl semimetals, i.e., solid-state systems which exhibit the elusive Weyl fermions as low-energy excitations. Here we show that the Nernst effect can be exploited as a sensitive probe for determining key parameters of the Weyl physics, applying it to the noncollinear antiferromagnet Mn3Ge. This compound exhibits anomalous thermoelectric transport due to enhanced Berry curvature from Weyl points located extremely close to the Fermi level. We establish from our data a direct measure of the Berry curvature at the Fermi level and, using a minimal model of a Weyl semimetal, extract the Weyl point energy and their distance in momentum space.

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE)

How to cite

APA:

Wuttke, C., Caglieris, F., Sykora, S., Scaravaggi, F., Wolter, A.A.U.B., Manna, K.,... Hess, C. (2019). Berry curvature unravelled by the anomalous Nernst effect in Mn3 Ge. Physical Review B, 100(8). https://doi.org/10.1103/PhysRevB.100.085111

MLA:

Wuttke, Christoph, et al. "Berry curvature unravelled by the anomalous Nernst effect in Mn3 Ge." Physical Review B 100.8 (2019).

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