Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Focus Session: Topology in 3D Reciprocal Space: Beyond Dirac and Weyl Quasiparticles (joint session TT/MA)

TT 43.7: Vortrag

Mittwoch, 3. April 2019, 18:00–18:15, H2

Thin-film investigations of 3D Dirac fermions in antiperovskite compounds — •Dennis Huang¹, Hiroyuki Nakamura¹, Eslam Khalaf^1,2, Pavel Ostrovsky^1,3, Kathrin Müller¹, Ulrich Starke¹, Alexander Yaresko¹, and Hidenori Takagi^1,4,5 — ¹Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — ²Department of Physics, Harvard University, Cambridge MA 02138, USA — ³L. D. Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia — ⁴Department of Physics, University of Tokyo, 113-0033 Tokyo, Japan — ⁵Institute for Functional Matter and Quantum Technologies, University of Stuttgart, 70569 Stuttgart, Germany

Topological semimetals hosting Dirac or Weyl fermions lie at the forefront of research in condensed matter physics. Recently, a class of antiperovskite compounds (A₃BO: A = Ca, Sr, Ba; B = Sn, Pb) have been predicted to possess both massive 3D Dirac fermions and topological surface states protected by crystal symmetry. Using molecular beam epitaxy, we grow thin films of the antiperovskite compounds Sr₃PbO and Sr₃SnO. We report ongoing efforts to elucidate the exotic electronic properties of these compounds using transport and spectroscopic probes.