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Linear and second order responses in topological semimetals

Asteazkena, Maiatzak 29, 2019 - 15:00
Donostia International Physics Center
Yan Sun, Max Planck Institute for Chemical Physics of Solids
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have found that the strong spin Hall effect in TaAs is mainly dominated from
the Weyl points and nodal-line-like Fermi surface, which implies a strong
interplay between the topological band structure and Berry curvature in
topological semimetals. With this guiding principle, we have successfully
understood the strong spin Hall effect in IrO2 and found the nodal line band structures in it. This principle was further verified by our
developed database. Generalizing this principle to time reversal symmetry
broken system, we have proposed strong anomalous Hall effect in magnetic
Weyl semimetal Co3Sn2S2. Owing to the low charge carrier density and large Berry curvature from the nodal line band structure, the
anomalous Hall conductivity and anomalous Hall angle experimentally reach up to
1130 S/cm and 20%, respectively. Further, the anomalous Hall effect can
even exist with zero net moment in the absence of the symmetry operation that
changes the sign of Berry curvature, and the anomalous Hall effect can be
strongly enhanced by the special band structures of Weyl points and nodal lines. Following this guiding direction, we have predicted a strong anomalous
Hall effect in the compensated ferrimagnetic Weyl semimetal Ti2MnAl and
noncollinear antiferromagnetic Weyl metal Mn3Ge with vanishing net
magnetic moments. Owing to time reversal symmetry, anomalous Hall effect is
forbidden in the first order perturbation, but the higher order response can exist. We have studied the Berry curvature dipole induced non-linear
anomalous Hall effect, which was experimentally observed very recently.

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