Systematic study of magnetotransport responses with Berry-Boltzmann equations and Wannier functions

Add to your list(s) Download to your calendar using vCal

• Stepan Tsirkin (University of Zurich)
• Wednesday 16 June 2021, 11:30-12:30
• Zoom.

If you have a question about this talk, please contact Chuck Witt.

There has recently been a huge renewed interest in the literature to the study of currents generated in solids by external electrical and magnetic fields, especially in relation with topology, Berry curvature and Weyl points. The responses of interest include nonlinear anomalous Hall effect, crystal Hall effect, planar Hall effect, unidirectional magnetoresistance and electrical magnetochiral anisotropy among others. In this talk I would like to show how all these responses are classified according to their properties with respect to the inversion and time-reversal symmetry, and how they can be systematically described by the Boltzmann equations modified by Berry curvature and intrinsic magnetic moment of Bloch states – the so-called “Berry-Boltzmann” equations. In addition the different terms contributing to the conductivity tensors are classified due to there 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 will also address some aspects of ab initio evaluation of such responses within Wannier functions formalism, and how we implement it in the WannierBerri code.

This talk is part of the Electronic Structure Discussion Group series.

This talk is included in these lists:

• All Cavendish Laboratory Seminars
• All Talks (aka the CURE list)
• CamBridgeSens
• Cambridge talks
• Centre for Health Leadership and Enterprise
• Combined TCM Seminars and TCM blackboard seminar listing
• Electronic Structure Discussion Group
• Featured lists
• Lennard-Jones Centre external
• Life Science Interface Seminars
• ME Seminar
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• PMRFPS's
• School of Physical Sciences
• Thin Film Magnetic Talks
• Trust & Technology Initiative - interesting events
• Zoom

Note that ex-directory lists are not shown.