Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: Topological Semimetals 2

TT 27.7: Vortrag

Dienstag, 17. März 2020, 15:30–15:45, HSZ 103

Magneto-optical probe of the fully gapped Dirac band in ZrSiS — •E. Uykur1, L. Z. Maulana1, L. M. Schoop2, B. V. Lotsch3,4, M. Dressel1, and A. V. Pronin111. Physikalishces Institut, Universität Stuttgart, 70569, Stuttgart, Germany — 2Department of Chemistry, Princeton University, Princeton, NJ, 08544, USA — 3Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — 4Chemistry Department, University of Munich (LMU), 81377 München, Germany

In this study, we present a far-infrared magneto-optical study of gapped nodal-line semimetal ZrSiS in the magnetic fields up to 7 T. Surprisingly, the magneto-optical spectra of ZrSiS can be explained within a simple 2D gapped-Dirac band model. Results demonstrate the inter- and intra-band transitions developing as √B with increasing B-field. The gap and Fermi velocity parameters can be extracted from the magneto-optical study are also consistent with the literature for the mentioned compound. Considering the average response over the Fermi surface is reflected in the optical studies, the narrow distribution of the parameters is expected. Finally, we will present a peculiar field-independent feature appearing in the spectra that might be related to the nodal-line nature of ZrSiS.

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