• DOI:10.1103/PhysRevB.100.085111
• Corpus ID: 119425468

Berry curvature unravelled by the anomalous Nernst effect in Mn3Ge

@article{Wuttke2019BerryCU,
  title={Berry curvature unravelled by the anomalous Nernst effect in 
Mn3Ge},
  author={Christoph Wuttke and Federico Caglieris and Steffen Sykora and F. Scaravaggi and Anja U. B. Wolter and Kaustuv Manna and Vicky Suss and Chandra Shekhar and Claudia Felser and Bernd Buchner and Christian Hess},
  journal={Physical Review B},
  year={2019}
}

• C. Wuttke, F. Caglieris, +8 authors C. Hess
• Published 5 February 2019
• Physics
• Physical Review B

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 non-collinear antiferromagnet Mn$_3$Ge. 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 for the first time the Weyl point energy and their distance in momentum-space.