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

Abstract

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.

Authors:
 [1];  [2];  [3];  [3];  [1];  [4]; ORCiD logo [5];  [5];  [5];  [6];  [3];  [7]
  1. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics, Key Lab. for Energy-Conversion Materials
  2. Tsinghua Univ., Beijing (China)
  3. Max Planck Society, Dresden (Germany). Max Planck Inst. for the Physics of Complex Systems
  4. Chinese Academy of Sciences (CAS), Beijing (China)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  6. 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
  7. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics, Key Lab. for Energy-Conversion Materials; Tsinghua Univ., Beijing (China)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1377502
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electronic properties and materials; topological insulators

Citation Formats

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., and Chen, Y. L. Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y). United States: N. p., 2016. Web. doi:10.1038/ncomms12924.
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. Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y). United States. doi:10.1038/ncomms12924.
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., and Chen, Y. L. Tue . "Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y)". United States. doi:10.1038/ncomms12924. https://www.osti.gov/servlets/purl/1377502.
@article{osti_1377502,
title = {Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y)},
author = {Liu, Z. K. and Yang, L. X. and Wu, S. -C. and Shekhar, C. and Jiang, J. and Yang, H. F. and Zhang, Y. and Mo, S. -K. and Hussain, Z. and Yan, B. and Felser, C. and Chen, Y. L.},
abstractNote = {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.},
doi = {10.1038/ncomms12924},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {9}
}

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