Regensburg 2019 – wissenschaftliches Programm

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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 43.6: Vortrag

Mittwoch, 3. April 2019, 17:45–18:00, H2

Optical conductivity studies of topological nodal semimetals — •Artem V. Pronin¹, David Neubauer¹, Micha B. Schilling¹, Felix Hütt¹, Martin Dressel¹, Alexander Yaresko², Leslie M. Schoop³, Chandra Shekhar⁴, and Claudia Felser⁴ — ¹1. Physikalisches Institut, Universität, Stuttgart, 70569 Stuttgart, Germany — ²MPI für Festkörperforschung, 70569 Stuttgart, Germany — ³Princeton University, Princeton, NJ 08544, USA — ⁴MPI für Chemische Physik fester Stoffe, 01187 Dresden, Germany

We have studied a large number of different topological nodal semimetals (TNSMs) by means of optical spectroscopy [1]. Theory predicts that the optical conductivity of TNSMs is not only distinct from the response of “ordinary” semiconductors and metals, but also very sensitive to the TNSM’s band structure and band dimensionality [2]. In real TNSMs, free-electron absorption and contributions from topologically trivial parabolic bands are essential. Both effects may mask the predicted behavior. Some of the studied materials are indeed affected by the aforementioned effects quite substantially. In the others, the low-energy optical response, related to the linear electronic bands, is clearly observed. In the course of the presentation, optical conductivity of the studied TNSMs will be discussed alongside the theory predictions.
PRB 93, 121202 (2016); PRL 119, 187401 (2017); PRL 121, 176601 (2018); PRB 98, 195203 (2018); JPCM 30, 485403 (2018).
PRL 108, 046602 (2012).