We will elucidate the nature of the linear-response tensors in planar-Hall and planar-thermal-Hall set-ups, where we subject a chiral 3D semimetal to the combined influence of an electric field (and/or temperature gradient) and a weak (i.e., non-quantising) magnetic field. We will explain why it is essential to include the effects of the intrinsic orbital magnetic moment of the wavepackets in conjunction with the Berry curvature, in order to obtain a holistic picture of the effects of topology of the Brillouin zone in the linear-response tensors. Going beyond the well-studied example of Weyl semimetals, we will discuss the cases of their multifold cousins, harbouring higher Chern numbers. We will highlight how we can compute the exact solutions from the Boltzmann equations, which gets rid of the often-inaccurate results of the naive the relaxation-time approximation.
Zoom link: https://icts-res-in.zoom.us/j/93137542286?pwd=SeMnBviyPVxT52WAwSkXrWyObBANgP.1
Meeting ID: 931 3754 2286
Passcode: 302010