The prediction of non-trivial topological electronic states in half-Heusler compounds makes these materials good candidates for discovering new physics and devices as half-Heusler phases harbour a variety of electronic ground states, including superconductivity, antiferromagnetism, and heavy-fermion behaviour. Here, we report a systematic studies of electronic properties of a superconducting half-Heusler compound YPtBi, in its normal state, investigated using angle-resolved photoemission spectroscopy. Our data reveal the presence of a Dirac state at the
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Abstract point of the Brillouin zone at 500 meV below the Fermi level. We observe the presence of multiple Fermi surface pockets, including two concentric hexagonal and six half-oval shaped pockets at the$$\Gamma$$ and K points of the Brillouin zone, respectively. Furthermore, our measurements show Rashba-split bands and multiple surface states crossing the Fermi level, this is also supported by the first-principles calculations. Our findings of a Dirac state in YPtBi contribute to the establishing of half-Heusler compounds as a potential platform for novel topological phases.$$\Gamma$$ -
Bensen, Erik A. ; Ciesielski, Kamil ; Gomes, Lídia C. ; Ortiz, Brenden R. ; Falke, Johannes ; Pavlosiuk, Orest ; Weber, Daniel ; Braden, Tara L. ; Steirer, Kenneth X. ; Szymański, Damian ; et al ( , Physical Review Materials)