Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: Transport: Weyl Semimetals

TT 24.12: Vortrag

Dienstag, 8. März 2016, 12:45–13:00, H18

Three-dimensional Dirac semimetal films grown by molecular beam epitaxy — Debakanta Samal¹, •Hiroyuki Nakamura¹, and Hidenori Takagi^1,2,3 — ¹Max Planck Institute for Solid State Research, Stuttgart, Germany — ²Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Stuttgart, Germany — ³Department of Physics, University of Tokyo, Japan

Antiperovskite compounds have recently been predicted to host bulk three-dimensional Dirac dispersion as well as surface states protected by crystal symmetry. We present fabrication of cubic antiperovskite Sr₃PbO films, which has six Dirac points along high-symmetry momentum axes. Films were grown epitaxially on LaAlO₃ substrates by molecular beam epitaxy and capped with polymer to facilitate ex-situ transport characterization. All of the films showed metallic temperature dependence. The Hall effect measurement suggests that the carrier type is hole, with density between 10¹⁹ - 10²⁰ cm⁻³. We will describe our ongoing effort to tune the Fermi energy close to the Dirac point, as well as detail of the low temperature magnetotransport.