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Handedness-dependent quasiparticle interference in the two enantiomers of the topological chiral semimetal PdGa.

  • Sessi P Max Planck Institute of Microstructure Physics, Halle, 06120, Germany. paolo.sessi@mpi-halle.mpg.de.
  • Fan FR Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany.
  • Küster F Max Planck Institute of Microstructure Physics, Halle, 06120, Germany.
  • Manna K Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany.
  • Schröter NBM Swiss Light Source, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland.
  • Ji JR Max Planck Institute of Microstructure Physics, Halle, 06120, Germany.
  • Stolz S EMPA, Swiss Federal Laboratories for Materials Science and Technology, 8600, Dübendorf, Switzerland.
  • Krieger JA Swiss Light Source, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland.
  • Pei D Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, United Kingdom.
  • Kim TK Diamond Light Source, Didcot, OX110DE, United Kingdom.
  • Dudin P Diamond Light Source, Didcot, OX110DE, United Kingdom.
  • Cacho C Diamond Light Source, Didcot, OX110DE, United Kingdom.
  • Widmer R EMPA, Swiss Federal Laboratories for Materials Science and Technology, 8600, Dübendorf, Switzerland.
  • Borrmann H Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany.
  • Shi W School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201203, China.
  • Chang K Max Planck Institute of Microstructure Physics, Halle, 06120, Germany.
  • Sun Y Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany.
  • Felser C Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany.
  • Parkin SSP Max Planck Institute of Microstructure Physics, Halle, 06120, Germany. stuart.parkin@mpi-halle.mpg.de.
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  • 2020-07-16
Published in:
  • Nature communications. - 2020
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy
General Chemistry
English It has recently been proposed that combining chirality with topological band theory results in a totally new class of fermions. Understanding how these unconventional quasiparticles propagate and interact remains largely unexplored so far. Here, we use scanning tunneling microscopy to visualize the electronic properties of the prototypical chiral topological semimetal PdGa. We reveal chiral quantum interference patterns of opposite spiraling directions for the two PdGa enantiomers, a direct manifestation of the change of sign of their Chern number. Additionally, we demonstrate that PdGa remains topologically non-trivial over a large energy range, experimentally detecting Fermi arcs in an energy window of more than 1.6 eV that is symmetrically centered around the Fermi level. These results are a consequence of the deep connection between chirality in real and reciprocal space in this class of materials, and, thereby, establish PdGa as an ideal topological chiral semimetal.
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  • English
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gold
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https://sonar.ch/global/documents/1031
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