Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Transport: Topological Semimetals 2 (jointly with DS, MA, HL, O)
TT 49.9: Vortrag
Mittwoch, 22. März 2017, 17:15–17:30, HSZ 204
Angle-dependent magnetoresistance in Weyl semimetals with long-range disorder — •Jan Behrends1 and Jens H Bardarson1,2 — 1Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany — 2Department of Theoretical Physics, KTH Royal Institute of Technology, Stockholm, SE-106 91 Sweden
The chiral anomaly is one of the most intriguing features of Weyl semimetals. It states that left- and right-handed fermions are not conserved individually, while their sum is. One of its experimental consequences is the negative magnetoresistance predicted in Weyl semimetals. Recent experiments show strong indications for such an anomalous conductivity response, while some outstanding issues remain. Most prominently, the anomalous response is much more sharply peaked for parallel magnetic and electric fields than expected from simple theoretical considerations. Here, we investigate scattering in Weyl semimetals in presence of magnetic fields for a correlated disorder potential. We find a decrease of the internode relaxation time when the magnetic field is tilted away from the separation of the Weyl nodes. Since the internode relaxation time is proportional to the anomaly-related conductivity, this feature may explain the narrow current plume seen experimentally.