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Handedness-dependent quasiparticle interference in the two enantiomers of the topological chiral semimetal PdGa
DOI:
10.1038/s41467-020-17261-x
Authors:
Paolo
Sessi
(Max Planck Institute of Microstructure Physics)
,
Feng-ren
Fan
(Max Planck Institute for Chemical Physics of Solids)
,
Felix
Küster
(Max Planck Institute of Microstructure Physics)
,
Kaustuv
Manna
(Max Planck Institute for Chemical Physics of Solids)
,
Niels B. M.
Schroeter
(Swiss Light Source)
,
Jing-rong
Ji
(Max Planck Institute of Microstructure Physics)
,
Samuel
Stolz
(EMPA, Swiss Federal Laboratories for Materials Science and Technology; EPFL)
,
Jonas A.
Krieger
(Swiss Light Source; Paul Scherrer Institut; ETH Zurich)
,
Ding
Pei
(University of Oxford)
,
Timur K.
Kim
(Diamond Light Source)
,
Pavel
Dudin
(Diamond Light Source)
,
Cephise
Cacho
(Diamond Light Source)
,
Remo N.
Widmer
(EMPA, Swiss Federal Laboratories for Materials Science and Technology)
,
Horst
Borrmann
(Max Planck Institute for Chemical Physics of Solids)
,
Wujun
Shi
(ShanghaiTech University)
,
Kai
Chang
(Max Planck Institute of Microstructure Physics)
,
Yan
Sun
(Max Planck Institute for Chemical Physics of Solids)
,
Claudia
Felser
(Max Planck Institute for Chemical Physics of Solids)
,
Stuart S. P.
Parkin
(Max Planck Institute of Microstructure Physics)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Nature Communications
, VOL 11
State:
Published (Approved)
Published:
July 2020
Diamond Proposal Number(s):
2470
,
20617

Abstract: 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.
Journal Keywords: Electronic properties and materials; Topological insulators
Subject Areas:
Materials,
Physics
Instruments:
I05-ARPES
Documents:
s41467-020-17261-x.pdf
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