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SUMMARY:Systematic study of magnetotransport responses with Berry-Boltzman
 n equations and Wannier functions - Stepan Tsirkin (University of Zurich)
DTSTART:20210616T103000Z
DTEND:20210616T113000Z
UID:TALK160183@talks.cam.ac.uk
CONTACT:Chuck Witt
DESCRIPTION:There has recently been a huge renewed interest in the literat
 ure to the study of currents generated in solids by external electrical an
 d magnetic fields\, especially in relation with topology\, Berry curvature
  and Weyl points. The responses of interest include nonlinear anomalous Ha
 ll effect\, crystal Hall effect\, planar Hall effect\, unidirectional magn
 etoresistance and electrical magnetochiral anisotropy among others. In thi
 s talk I would like to show how all these responses are classified accordi
 ng to their properties with respect to the inversion and time-reversal sym
 metry\, and how they can be systematically described by the Boltzmann equa
 tions modified by Berry curvature and intrinsic magnetic moment of Bloch s
 tates - the so-called "Berry-Boltzmann" equations. In addition the differe
 nt terms contributing to the conductivity tensors are classified due to th
 ere microscopic origin as being classical or due to Berry curvature and/or
  intrinsic magnetic moment. I will also discuss what we should call "Hall"
  and "Ohmic" conductivities in the nonlinear responses\, and how they may 
 be extracted from a particular conductivity tensor. If time permits\, I wi
 ll also address some aspects of ab initio evaluation of such responses wit
 hin Wannier functions formalism\, and how we implement it in the WannierBe
 rri code.
LOCATION:Zoom
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