Berry curvature unravelled by the Nernst effect in Mn${}_3$Ge

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 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.

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Cited by in corpus (50)

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• Anomalous and topological Hall effects in epitaxial thin films of the noncollinear antiferromagnet Mn${}_3$Sn
• Finite-temperature violation of the anomalous transverse Wiedemann-Franz law
• Intrinsic anomalous Nernst effect amplified by disorder in a half-metallic semimetal
• Exchange-biased topological transverse thermoelectric effects in a Kagome ferrimagnet
• Spin-Polarized Antiferromagnetic Spintronics
• Semiclassical equations of motion for disordered conductors: extrinsic interband velocity, corrected collision integral and spin-orbit torques
• Tunable magneto-optical effect, anomalous Hall effect and anomalous Nernst effect in two-dimensional room-temperature ferromagnet $1T$-CrTe${}_2$
• Observation of the anomalous Nernst effect in altermagnetic candidate Mn5Si3
• Large anomalous Nernst and inverse spin-Hall effects in epitaxial thin films of Kagome semimetal Mn${}_3$Ge
• Creation of flexible spin-caloritronic material with giant transverse thermoelectric conversion by nanostructure engineering
• Thermal Transport for Probing Quantum Materials
• Large Anomalous Hall Effect at Room Temperature in a Fermi-Level-Tuned Kagome Antiferromagnet
• Intrinsic Magnetic Topological Materials
• Pressure tuning of the anomalous Hall effect in the chiral antiferromagnet Mn3Ge
• Complex magnetic structure and spin waves of the noncollinear antiferromagnet Mn5Si3
• Multifunctional composite magnet realizing record-high transverse thermoelectric generation
• Thermal and thermoelectric properties of an antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Quantum kinetic theory of quadratic responses
• How correlations change the magnetic structure factor of the kagome Hubbard model
• Origin of negative anomalous Nernst thermopower in Mn-Ga ordered alloys
• Anomalous Nernst effect in the noncollinear antiferromagnet Mn${}_5$Si${}_3$
• Evolution of Magnetism in Magnetic Topological Semimetal NdSb${}_x$Te${}_{2-x+\delta }$
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• Unconventional magneto-resistance, and electronic transition in Mn${}_3$Ge Weyl semimetal
• Seebeck-driven transverse thermoelectric generation in on-chip devices
• Modulation of the Nernst Thermoelectrics by Regulating the Anomalous Hall and Nernst Angles
• Onsager reciprocal relation between anomalous transverse coefficients of an anisotropic antiferromagnet
• Ultrahigh Anomalous Nernst Thermopower and Thermal Hall Angle in YbMnBi2
• Simultaneous achievement of large anomalous Nernst effect and reduced thermal conductivity in sintered polycrystalline topological Heusler ferromagnets
• ErMn${}_6$Sn${}_6$: A Promising Kagome Antiferromagnetic Candidate for Room-Temperature Nernst Effect-based thermoelectrics
• Direct electrical probing of anomalous Nernst conductivity
• Anomalous Nernst effect in ferromagnetic Mn${}_5$Ge${}_3$C${}_x$ thin films on insulating sapphire
• Nonlinear anomalous transverse responses induced by Berry curvature quadrupole in systems with broken time-reversal symmetry
• Large Anomalous and Topological Hall Effect and Nernst Effect in a Dirac Kagome Magnet Fe3Ge
• Giant anomalous Nernst signal in the antiferromagnet YbMnBi2
• Anomalous Hall effect and magnetic structure of the topological semimetal (Mn${}_{0.78}$Fe${}_{0.22}$)${}_3$Ge
• Tuning of Electrical, Magnetic, and Topological Properties of Magnetic Weyl Semimetal Mn${}_{3+x}$Ge by Fe doping
• Weyl points and anomalous transport effects tuned by the Fe doping in Mn${}_3$Ge Weyl semimetal
• Colossal anomalous Nernst effect in a correlated noncentrosymmetric kagome ferromagnet
• Probing magnetic anisotropy in Kagome antiferromagnetic Mn${}_3$Ge with torque magnetometry
• Evolution of Magnetoresistance in the magnetic topological semimetals NdSbxTe2-x
• Unusual Multiple Magnetic Transitions and Anomalous Hall Effect Observed in Antiferromagnetic Weyl Semimetal, Mn${}_{2.94}$Ge (Ge-rich)
• Topological Lifshitz transition-induced bipolarity of anomalous Nernst effect in kagome magnet YCo3
• Nernst Plateau in the Quantum Limit of Low-Carrier-Density Topological Insulators