Giant Magnetochiral Anisotropy in Weyl-semimetal WTe2 Induced by Diverging Berry Curvature

Abstract

The concept of Berry curvature is essential for various transport phenomena. However, an effect of the Berry curvature on magnetochiral anisotropy, i.e. nonreciprocal magneto-transport, is still elusive. Here, we report the Berry curvature originates the large magnetochiral anisotropy. In Weyl-semimetal WTe2, we observed the strong enhancement of the magnetochiral anisotropy when the Fermi level is located near the Weyl points. Notably, the maximal figure of merit $\bar{\gamma }$ reaches $1.2\times 10^{-6}{\mathrm{m}}^2{\mathrm{T}}^{-1}{\mathrm{A}}^{-1}$, which is the largest ever reported in bulk materials. Our semiclassical calculation shows that the diverging Berry curvature at the Weyl points strongly enhances the magnetochiral anisotropy.

arXiv comment26 pages

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• Quantum theory of the magnetochiral anisotropy coefficient in ZrTe${}_5$
• Nonlinear magnetotransport in MoTe${}_2$
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• Orbital enhanced intrinsic nonlinear planar Hall effect for probing topological phase transition in CuTlSe${}_2$
• Identifying geometric third-order nonlinear transport in disordered materials
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