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TT: Fachverband Tiefe Temperaturen
TT 24: Transport: Weyl Semimetals
TT 24.7: Vortrag
Dienstag, 8. März 2016, 11:30–11:45, H18
Apparent negative magnetoresistance without independent Weyl pockets in the Weyl semimetal TaP — •Elena Hassinger1, Frank Arnold1, Marcel Naumann1, Shu-Chun Wu1, Yan Sun1, Ricardo Donizeth dos Reis1, Mukkattu O. Ajeesh1, Chandra Shekhar1, Nitesh Kumar1, Marcus Schmidt1, Adolfo Grushin2, Jens Bardarson2, Michael Baenitz1, Horst Borrmann1, Michael Nicklas1, Claudia Felser1, and Binghai Yan1,2 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Max Planck Institute for Physics of Complex Systems, Dresden, Germany
In the recently discovered Weyl semimetals, an unconventional negative longitudinal magnetoresistance is expected due to a phenomenon called chiral anomaly. An open question is, how close the Fermi energy needs to be to the Weyl nodes, in order to detect this phenomenon. This question can only be adressed by knowing the electronic bandstructure, i.e. the position of the Fermi energy, and the intrinsic longitudinal magnetoresistance precisely. Here, we report the detailed Fermi surface topology of the Weyl semimetal TaP determined via angle-resolved quantum oscillation spectra combined with band-structure calculations. The Fermi surface consists of an electron and a hole banana without independent pockets around the Weyl points. Although the absence of independent Fermi surface pockets around the Weyl points means that no chiral anomaly is expected, we detect a negative longitudinal magnetoresistance. We discuss possible origins.