Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y)

Liu, Z. K.; Yang, L. X.; Wu, S. -C.; Shekhar, C.; Jiang, J.; Yang, H. F.; Zhang, Y.; Mo, S. -K.; Hussain, Z.; Yan, B.; Felser, C.; Chen, Y. L.

doi:10.1038/ncomms12924

Title: Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y)

Journal Article · 26 September 2016 · Nature Communications

DOI: https://doi.org/10.1038/ncomms12924 · OSTI ID:1377502

Liu, Z. K. ^[1]; Yang, L. X. ^[2]; Wu, S. -C. ^[3]; Shekhar, C. ^[3]; Jiang, J. ^[1]; Yang, H. F. ^[4];

^[5]; Mo, S. -K. ^[5]; Hussain, Z. ^[5]; Yan, B. ^[6]; Felser, C. ^[3]; Chen, Y. L. ^[7]

Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics, Key Lab. for Energy-Conversion Materials
Tsinghua Univ., Beijing (China)
Max Planck Society, Dresden (Germany). Max Planck Inst. for the Physics of Complex Systems
Chinese Academy of Sciences (CAS), Beijing (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics, Key Lab. for Energy-Conversion Materials; Max Planck Society, Dresden (Germany). Max Planck Inst. for the Physics of Complex Systems
Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics, Key Lab. for Energy-Conversion Materials; Tsinghua Univ., Beijing (China)

Topological quantum materials represent a new class of matter with both exotic physical phenomena and novel application potentials. Many Heusler compounds, which exhibit rich emergent properties such as unusual magnetism, superconductivity and heavy fermion behaviour, have been predicted to host non-trivial topological electronic structures. The coexistence of topological order and other unusual properties makes Heusler materials ideal platform to search for new topological quantum phases (such as quantum anomalous Hall insulator and topological superconductor). By carrying out angle-resolved photoemission spectroscopy and ab initio calculations on rare-earth half-Heusler compounds LnPtBi (Ln=Lu, Y), we directly observe the unusual topological surface states on these materials, establishing them as first members with non-trivial topological electronic structure in this class of materials. Moreover, as LnPtBi compounds are non-centrosymmetric superconductors, our discovery further highlights them as promising candidates of topological superconductors.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1377502

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y)

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