Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Topological Semimetals 1

TT 21.2: Vortrag

Dienstag, 17. März 2020, 09:45–10:00, HSZ 103

The chiral anomaly in Weyl semimetals as seen by opticsEce Uykur1, Lucky Z. Maulana1, Shekhar Chandra2, Claudia Felser2, Martin Dressel1, and •Artem V. Pronin111. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany — 2MPI für Chemische Physik fester Stoffe, 01187 Dresden, Germany

The density imbalance between the electronic excitations with different chiralities in simultaneously applied parallel electric and magnetic fields, the chiral anomaly, is perhaps the most fascinating phenomenon occurring in Weyl semimetals. The existing experimental results reported on the chiral anomaly are mostly based on electrical-transport measurements using direct current, for example, on observations of the negative longitudinal magnetoresistance. However, it has been argued that dc transport may suffer from other effects, such as current jetting. Reports on detecting the chiral anomaly by other experimental methods are therefore of paramount importance. Here, we report on optical observations of the chiral anomaly in the Weyl semimetals TaAs and NbAs and also in GdPtPi, a triple-point semimetal, which becomes a Weyl semimetal upon application of a magnetic field.

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