%0 Journal Article %1 yao2020observation %A Yao, Mengyu %A Manna, Kaustuv %A Yang, Qun %A Fedorov, Alexander %A Voroshnin, Vladimir %A Schwarze, B. Valentin %A Hornung, Jacob %A Chattopadhyay, S. %A Sun, Zhe %A Guin, Satya N %A Wosnitza, Jochen %A Borrmann, Horst %A Shekhar, Chandra %A Kumar, Nitesh %A Fink, Jörg %A Sun, Yan %A Felser, Claudia %D 2020 %J Nat Commun %K a b %N 2033 %R 10.1038/s41467-020-15865-x %T Observation of giant spin-split Fermi-arc with maximal Chern number in the chiral topological semimetal PtGa %U https://doi.org/10.1038/s41467-020-15865-x %V 11 %X 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.

@article{yao2020observation, 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.}, added-at = {2020-12-28T17:23:36.000+0100}, author = {Yao, Mengyu and Manna, Kaustuv and Yang, Qun and Fedorov, Alexander and Voroshnin, Vladimir and Schwarze, B. Valentin and Hornung, Jacob and Chattopadhyay, S. and Sun, Zhe and Guin, Satya N and Wosnitza, Jochen and Borrmann, Horst and Shekhar, Chandra and Kumar, Nitesh and Fink, Jörg and Sun, Yan and Felser, Claudia}, biburl = {https://www.bibsonomy.org/bibtex/281e9e7f0bcd68e29c5e4c89c26d0c6bf/ctqmat}, day = 27, description = {Observation of giant spin-split Fermi-arc with maximal Chern number in the chiral topological semimetal PtGa | Nature Communications}, doi = {10.1038/s41467-020-15865-x}, interhash = {24ad87f16c6b305435611e5fc316f08f}, intrahash = {81e9e7f0bcd68e29c5e4c89c26d0c6bf}, issn = {20411723}, journal = {Nat Commun}, keywords = {a b}, month = {4}, note = {cite arxiv:2003.07712Comment: Accepted in Nature Communications}, number = 2033, refid = {Yao2020}, timestamp = {2023-10-19T12:24:58.000+0200}, title = {Observation of giant spin-split Fermi-arc with maximal Chern number in the chiral topological semimetal PtGa}, type = {Publication}, url = {https://doi.org/10.1038/s41467-020-15865-x}, volume = 11, year = 2020 }