Field-free platform for topological zero-energy mode in superconductors LiFeAs and PbTaSe$_2$
| Autor: | Zhang, Songtian S., Yin, Jia-Xin, Dai, Guangyang, Zhao, Lingxiao, Chang, Tay-Rong, Shumiya, Nana, Jiang, Kun, Zheng, Hao, Bian, Guang, Multer, Daniel, Litskevich, Maksim, Chang, Guoqing, Belopolski, Ilya, Cochran, Tyler A., Wu, Xianxin, Wu, Desheng, Luo, Jianlin, Chen, Genfu, Lin, Hsin, Chou, Fang-Cheng, Wang, Xiancheng, Jin, Changqing, Sankar, Raman, Wang, Ziqiang, Hasan, M. Zahid |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 101, 100507 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.101.100507 |
| Popis: | Superconducting materials exhibiting topological properties are emerging as an exciting platform to realize fundamentally new excitations from topological quantum states of matter. In this work, we explore the possibility of a field-free platform for generating Majorana zero energy excitations by depositing magnetic Fe impurities on the surface of candidate topological superconductors, LiFeAs and PbTaSe$_2$. We use scanning tunneling microscopy to probe localized states induced at the Fe adatoms on the atomic scale and at sub-Kelvin temperatures. We find that each Fe adatom generates a striking zero-energy bound state inside the superconducting gap, which do not split in magnetic fields up to 8T, underlining a nontrivial topological origin. Our findings point to magnetic Fe adatoms evaporated on bulk superconductors with topological surface states as a new platform for exploring Majorana zero modes and quantum information science under field-free conditions. Comment: 11 pages, 3 figures |
| Databáze: | arXiv |
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