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CAMP Seminar: Berry curvature and its dipole moment in Weyl semimetal materials

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Bing Hai Yan, Weizmann Institute of Science, Israel
When
29 August 2017 from 2:30 PM to 3:30 PM
Where
339 Davey Laboratory
Contact Name
Chaoxing Liu
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In the band structure of a Weyl semimetal (WSM), the conduction and valence bands cross each linearly through Weyl points that are usually treated as “monopoles” of the Berry curvature. As a linear response, WSMs can exhibit intrinsic anomalous Hall effect (when time-reversal symmetry is broken) and spin Hall effect due to the Berry curvature. As a second-order nonlinear response, time-reversal-symmetric WSMs were very recently predicted to show an exotic nonlinear Hall effect. This is caused by the non-equilibrium distribution of the Berry curvature, described as the “dipole” of the Berry curvature. In this talk, I will talk about our recent theoretical results on the spin Hall effect and nonlinear Hall effect for WSM materials TaAs (Type-I WSM), MoTe2 (Type-II WSM) and Mn3Sn (Room-temperature non-collinear antiferromagnet).

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