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TT: Fachverband Tiefe Temperaturen

TT 43: Focus Session: Topology in 3D Reciprocal Space: Beyond Dirac and Weyl Quasiparticles (joint session TT/MA)

TT 43.5: Hauptvortrag

Mittwoch, 3. April 2019, 17:15–17:45, H2

Investigations of Dirac/Weyl semimetals under external stimuli — •Ece Uykur — 1. Physikalisches Institut, Universität Stuttgart, Stuttgart, Germany

Dirac/Weyl semimetals acquire 3D linearly dispersive electronic bands, as opposed to the parabolic bands, with band crossings near the Fermi energy, where the low energy excitations are described by the relativistic Weyl or Dirac equations. Optical spectroscopy is one of the strongest methods to probe these low energy responses. Moreover, it can be coupled to an external tuning mechanism such as magnetic fields, pressure, etc. Additional tuning parameters can be used to create a Dirac/Weyl state and/or to provide valuable information about the nature of the observed topological state. A peculiar magnetic field dependence of the Landau-level transitions, for instance, would hint the existence of the massless Dirac/Weyl fermions in the studied system. In this talk, I will summarize our efforts on different Weyl/Dirac semimetals and their optical responses under an external tuning parameter.