Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 99: Poster Session: Transport

TT 99.3: Poster

Donnerstag, 15. März 2018, 15:00–19:00, Poster B

Transport spectroscopy of 3D Dirac materials — •Henry Legg and Achim Rosch — Institute for Theoretical Physics, University of Cologne, Zülpicher Straße 77, D-50937, Köln, Deutschland

Many materials that realise a 3D Dirac or Weyl dispersion contain multiple Dirac nodes within their Brillouin zone; examples include Cd₂ As₂, Na₃ Bi, and Pb_1−xSn_x Se. In this work we propose a new transport mechanism to ‘spectroscopically’ map the bulk electronic structure of a 3D Dirac or Weyl semi-metal with multiple nodes within the Brillouin zone.

A positive magnetoresistance occurs when parallel magnetic and electric fields are orientated in a direction perpendicular to a vector connecting a pair of these Dirac nodes. In the presence of long ranged impurities this magnetoresistance becomes strongly dependent on angle. This angular dependence provides information about the position of Fermi-surfaces within the Brillouin zone, the Fermi-wave vector, and the extent of impurities within the material. Our results are compared to experiments on Pb_1−xSn_x Se.