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Huang, Z.; Liu, W. L.; Wang, H. Y.; Su, Y. L.; Liu, Z. T.; Shi, X. B.; Gao, S. Y.; Chen, Z. Y.; Yan, Y. J.; Jiang, Z. C.; Liu, Z. H.; Liu, J. S.; Lu, X. L.; Yang, Y. C.; Zhou, R. X.; Xia, W.; Huang, Y. B.; Qiao, S.; Zhao, W. W.; Guo, Y. F.; Li, G.; Shen, D. W.
npj quantum materials, 06/2022, Letnik: 7, Številka: 1Journal Article
Abstract Topological superconductors have long been predicted to host Majorana zero modes which obey non-Abelian statistics and have potential for realizing non-decoherence topological quantum computation. However, material realization of topological superconductors is still a challenge in condensed matter physics. Utilizing high-resolution angle-resolved photoemission spectroscopy and first-principles calculations, we predict and then unveil the coexistence of topological Dirac semimetal and topological insulator states in the vicinity of Fermi energy ( E F ) in the titanium-based oxypnictide superconductor BaTi 2 Sb 2 O. Further spin-resolved measurements confirm its spin-helical surface states around E F , which are topologically protected and give an opportunity for realization of Majorana zero modes and Majorana flat bands in one material. Hosting dual topological states, the intrinsic superconductor BaTi 2 Sb 2 O is expected to be a promising platform for further investigation of topological superconductivity.
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