Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co 3 Sn 2 S 2 .

Autor: Morali N; Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel., Batabyal R; Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel., Nag PK; Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel., Liu E; Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.; Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China., Xu Q; Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany., Sun Y; Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany., Yan B; Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel., Felser C; Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.; John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.; Department of Physics, Harvard University, Cambridge, MA 02138, USA., Avraham N; Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel., Beidenkopf H; Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel. haim.beidenkopf@weizmann.ac.il.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2019 Sep 20; Vol. 365 (6459), pp. 1286-1291.
DOI: 10.1126/science.aav2334
Abstrakt: Bulk-surface correspondence in Weyl semimetals ensures the formation of topological "Fermi arc" surface bands whose existence is guaranteed by bulk Weyl nodes. By investigating three distinct surface terminations of the ferromagnetic semimetal Co 3 Sn 2 S 2 , we verify spectroscopically its classification as a time-reversal symmetry-broken Weyl semimetal. We show that the distinct surface potentials imposed by three different terminations modify the Fermi-arc contour and Weyl node connectivity. On the tin (Sn) surface, we identify intra-Brillouin zone Weyl node connectivity of Fermi arcs, whereas on cobalt (Co) termination, the connectivity is across adjacent Brillouin zones. On the sulfur (S) surface, Fermi arcs overlap with nontopological bulk and surface states. We thus resolve both topologically protected and nonprotected electronic properties of a Weyl semimetal.
(Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.)
Databáze: MEDLINE
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