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Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y)
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Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y)
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Journal Article
Observation of unusual topological surface states in half-Heusler compounds LnPtBi (Ln=Lu, Y)
2016
Overview
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.
Heusler compounds have been predicted to host topological order with other emergent properties, which yet awaits for experimental evidence. Here, Liu
et al
. report a direct observation of topological surface states on half-Heusler compounds LnPtBi.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
