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Title: Observation of giant spin-split Fermi-arc with maximal Chern number in the chiral topological semimetal PtGa
Authors: Yao, M.Manna, K.Yang, Q.Fedorov, A.Voroshnin, V.Valentin Schwarze, B.Hornung, J.Chattopadhyay, S.Sun, Z.Guin, S.N.Wosnitza, J.Borrmann, H.Shekhar, C.Kumar, N.Fink, J.Sun, Y.Felser, C.
Publishers Version:
Issue Date: 2020
Published in: Nature Communications Vol. 11 (2020), No. 1
Publisher: London : Nature Publishing Group
Abstract: Non-symmorphic chiral topological crystals host exotic multifold fermions, and their associated Fermi arcs helically wrap around and expand throughout the Brillouin zone between the high-symmetry center and surface-corner momenta. However, Fermi-arc splitting and realization of the theoretically proposed maximal Chern number rely heavily on the spin-orbit coupling (SOC) strength. In the present work, we investigate the topological states of a new chiral crystal, PtGa, which has the strongest SOC among all chiral crystals reported to date. With a comprehensive investigation using high-resolution angle-resolved photoemission spectroscopy, quantum-oscillation measurements, and state-of-the-art ab initio calculations, we report a giant SOC-induced splitting of both Fermi arcs and bulk states. Consequently, this study experimentally confirms the realization of a maximal Chern number equal to ±4 in multifold fermionic systems, thereby providing a platform to observe large-quantized photogalvanic currents in optical experiments.
Keywords: experimental study; measurement method; observational method; spectroscopy; theoretical study; topology; ab initio calculation; angle resolved photoemission spectroscopy; article; chirality; controlled study; crystal; oscillometry
DDC: 530
License: CC BY 4.0 Unported
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