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Magneto-optical conductivity in generic Weyl semimetals | | Marcus Stålhammar
; Jorge Larana-Aragon
; Johannes Knolle
; Emil J. Bergholtz
; | | Date: |
15 Sep 2020 | | Abstract: | Magneto-optical studies of Weyl semimetals have been proposed as a versatile
tool for observing low energy Weyl fermions in candidate materials including
the chiral Landau level. However, previous theoretical results have been
restricted to the linearized regime around the Weyl node and are at odds with
experimental findings. Here, we derive a closed form expression for the
magneto-optical conductivity of generic Weyl semimetals in the presence of an
external magnetic field aligned with the tilt of the spectrum. The systems are
taken to have linear dispersion in two directions, while the tilting direction
can consist of any arbitrary continuously differentiable function. This general
calculation is then used to analytically evaluate the magneto-optical
conductivity of Weyl semimetals expanded to cubic order in momentum. In
particular, systems with arbitrary tilt, as well as systems hosting trivial
Fermi pockets are investigated. The higher order terms in momentum close the
Fermi pockets in the type-II regime, removing the need for unphysical cut-offs
when evaluating the magneto-optical conductivity. Crucially, the ability to
take into account closed over-tilted and additional trivial Fermi pockets
allows us to treat model systems closer to actual materials and we propose a
simple explanation why the presence of parasitic trivial Fermi pockets can mask
the characteristic signature of Weyl fermions in magneto-optical conductivity
measurements. | | Source: | arXiv, 2009.07018 | | Services: | Forum | Review | PDF | Favorites | |
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