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  Observation and control of maximal Chern numbers in a chiral topological semimetal

Schröter, N. B. M., Stolz, S., Manna, K., de Juan, F., Vergniory, M. G., Krieger, J. A., et al. (2020). Observation and control of maximal Chern numbers in a chiral topological semimetal. Science, 369(6500), 179-183. doi:10.1126/science.aaz3480.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-B355-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-B356-F
Genre: Journal Article

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 Creators:
Schröter, Niels B. M.1, Author
Stolz, Samuel1, Author
Manna, Kaustuv2, Author              
de Juan, Fernando1, Author
Vergniory, Maia G.1, Author
Krieger, Jonas A.1, Author
Pei, Ding1, Author
Schmitt, Thorsten1, Author
Dudin, Pavel1, Author
Kim, Timur K.1, Author
Cacho, Cephise1, Author
Bradlyn, Barry1, Author
Borrmann, Horst3, Author              
Schmidt, Marcus4, Author              
Widmer, Roland1, Author
Strocov, Vladimir N.1, Author
Felser, Claudia5, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863410              
4Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              
5Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Topologically nontrivial electronic structure can often be characterized by the Chern number, the value of which is related to the magnitude of some of the exotic effects predicted to occur in such systems. Many topological phases discovered so far have a Chern number of 1 or 2, but higher values are also theoretically possible. Schröter et al. predicted that the chiral material palladium gallium (PdGa) would have a Chern number of 4, and they confirmed that prediction using photoemission experiments. Interestingly, the sign of the Chern number was opposite for the two enantiomers of PdGa.Science, this issue p. 179Topological semimetals feature protected nodal band degeneracies characterized by a topological invariant known as the Chern number (C). Nodal band crossings with linear dispersion are expected to have at most |C|=4, which sets an upper limit to the magnitude of many topological phenomena in these materials. Here, we show that the chiral crystal palladium gallium (PdGa) displays multifold band crossings, which are connected by exactly four surface Fermi arcs, thus proving that they carry the maximal Chern number magnitude of 4. By comparing two enantiomers, we observe a reversal of their Fermi-arc velocities, which demonstrates that the handedness of chiral crystals can be used to control the sign of their Chern numbers.

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Language(s): eng - English
 Dates: 2020-07-102020-07-10
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1126/science.aaz3480
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Title: Science
  Other : Science
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Association for the Advancement of Science
Pages: - Volume / Issue: 369 (6500) Sequence Number: - Start / End Page: 179 - 183 Identifier: ISSN: 0036-8075
CoNE: https://pure.mpg.de/cone/journals/resource/991042748276600_1