Evidence of superconducting Fermi arcs
成果类型：
Article
署名作者：
Kuibarov, Andrii; Suvorov, Oleksandr; Vocaturo, Riccardo; Fedorov, Alexander; Lou, Rui; Merkwitz, Luise; Voroshnin, Vladimir; Facio, Jorge I.; Koepernik, Klaus; Yaresko, Alexander; Shipunov, Grigory; Aswartham, Saicharan; van den Brink, Jeroen; Buechner, Bernd; Borisenko, Sergey
署名单位：
Leibniz Association; Leibniz Institute for Solid State & Materials Research Dresden; Institute for Integrative Nanosciences (IIN); National Academy of Sciences Ukraine; Kyiv Academic University; Helmholtz Association; Helmholtz-Zentrum fuer Materialien und Energie GmbH (HZB); Max Planck Society; Helmholtz Association; Helmholtz-Zentrum Dresden-Rossendorf (HZDR)
刊物名称：
Nature
ISSN/ISSBN：
0028-5616
DOI：
10.1038/s41586-023-06977-7
发表日期：
2024-02-08
关键词：
摘要：
An essential ingredient for the production of Majorana fermions for use in quantum computing is topological superconductivity1,2. As bulk topological superconductors remain elusive, the most promising approaches exploit proximity-induced superconductivity3, making systems fragile and difficult to realize4-7. Due to their intrinsic topology8, Weyl semimetals are also potential candidates1,2, but have always been connected with bulk superconductivity, leaving the possibility of intrinsic superconductivity of their topological surface states, the Fermi arcs, practically without attention, even from the theory side. Here, by means of angle-resolved photoemission spectroscopy and ab initio calculations, we identify topological Fermi arcs on two opposing surfaces of the non-centrosymmetric Weyl material trigonal PtBi2 (ref. 9). We show these states become superconducting at temperatures around 10 K. Remarkably, the corresponding coherence peaks appear as the strongest and sharpest excitations ever detected by photoemission from solids. Our findings indicate that superconductivity in PtBi2 can occur exclusively at the surface, rendering it a possible platform to host Majorana modes in intrinsically topological superconductor-normal metal-superconductor Josephson junctions. We provide evidence for superconducting topological Fermi arcs in PbBi2-a Weyl semimetal previously studied mostly for its bulk properties-from which Marjorama fermions could be derived for research in quantum computers.