Manifestations of band geometry in linear and nonlinear transport

Wednesday, February 3, 2021 - 4:00pm
Event Type: 

I will describe how the geometry of the band structure of metals manifests itself in their optical and transport properties. I particular, I will show that the natural optical activity of metals, equivalent to the so-called dynamic chiral magnetic effect, stems from the intrinsic magnetic moments of quasiparticles, and demonstrate that these magnetic moments can be of both intrinsic and extrinsic origin. I will then discuss optical Hall response of chiral crystals in the presence of a DC transport current – the gyrotropic Hall effect – and show that it is related to the Berry curvature dipole. The latter fact makes the gyrotropic Hall effect a diagnostic tool for topological properties of three-dimensional chiral metals. If time permits, I will discuss how to observe the chiral magnetic effect in Weyl semimetals using the heating effect of a transport electric field.

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Dmytro Pesin, University of Virginia
Giovanni Vignale