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  Evidence for one-dimensional chiral edge states in a magnetic Weyl semimetal Co3Sn2S2

Howard, S., Jiao, L., Wang, Z., Morali, N., Batabyal, R., Kumar-Nag, P., et al. (2021). Evidence for one-dimensional chiral edge states in a magnetic Weyl semimetal Co3Sn2S2. Nature Communications, 12: 4269, pp. 1-7. doi:10.1038/s41467-021-24561-3.

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 Creators:
Howard, Sean1, Author
Jiao, Lin1, Author
Wang, Zhenyu1, Author
Morali, Noam1, Author
Batabyal, Rajib1, Author
Kumar-Nag, Pranab1, Author
Avraham, Nurit1, Author
Beidenkopf, Haim1, Author
Vir, Praveen2, Author              
Liu, Enke2, Author              
Shekhar, Chandra3, Author              
Felser, Claudia4, Author              
Hughes, Taylor1, Author
Madhavan, Vidya1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863428              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: high temperature, instrumentation, one-dimensional modeling, quantum mechanics, symmetry, topology, article, chirality, computer simulation, scanning tunneling spectroscopy
 Abstract: The physical realization of Chern insulators is of fundamental and practical interest, as they are predicted to host the quantum anomalous Hall (QAH) effect and topologically protected chiral edge states which can carry dissipationless current. Current realizations of the QAH state often require complex heterostructures and sub-Kelvin temperatures, making the discovery of intrinsic, high temperature QAH systems of significant interest. In this work we show that time-reversal symmetry breaking Weyl semimetals, being essentially stacks of Chern insulators with inter-layer coupling, may provide a new platform for the higher temperature realization of robust chiral edge states. We present combined scanning tunneling spectroscopy and theoretical investigations of the magnetic Weyl semimetal, Co3Sn2S2. Using modeling and numerical simulations we find that depending on the strength of the interlayer coupling, chiral edge states can be localized on partially exposed kagome planes on the surfaces of a Weyl semimetal. Correspondingly, our dI/dV maps on the kagome Co3Sn terraces show topological states confined to the edges which display linear dispersion. This work provides a new paradigm for realizing chiral edge modes and provides a pathway for the realization of higher temperature QAH effect in magnetic Weyl systems in the two-dimensional limit. © 2021, The Author(s).

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Language(s): eng - English
 Dates: 2021-07-132021-07-13
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1038/s41467-021-24561-3
 Degree: -

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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 12 Sequence Number: 4269 Start / End Page: 1 - 7 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723