| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Fe$_{1+y}$Te$_{x}$Se$_{1-x}$: A Delicate and Tunable Majorana Material |
| Fazhi Yang1,2†, Giao Ngoc Phan1,3†*, Renjie Zhang1,2, Jin Zhao1,2, Jiajun Li1,2, Zouyouwei Lu1,2, John Schneeloch4, Ruidan Zhong4,6, Mingwei Ma1,5, Genda Gu4, Xiaoli Dong1,2,5, Tian Qian1,5, and Hong Ding1,3,6* |
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physics, University of Chinese Academy of Sciences, Beijing 100190, China
3CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
4Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, USA
5Songshan Lake Materials Laboratory, Dongguan 523808, China
6Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 201210, China
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| Cite this article: |
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Fazhi Yang, Giao Ngoc Phan, Renjie Zhang et al 2023 Chin. Phys. Lett. 40 017401 |
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Abstract We report the observation for the $p_{z}$ electron band and the band inversion in Fe$_{1+y}$Te$_{x}$Se$_{1-x}$ with angle-resolved photoemission spectroscopy. Furthermore, we found that excess Fe ($y> 0$) inhibits the topological band inversion in Fe$_{1+y}$Te$_{x}$Se$_{1-x}$, which explains the absence of Majorana zero modes in previous reports for Fe$_{1+y}$Te$_{x}$Se$_{1-x}$ with excess Fe. Based on our analysis of different amounts of Te doping and excess Fe, we propose a delicate topological phase in this material. Thanks to this delicate phase, one may be able to tune the topological transition via applying lattice strain or carrier doping.
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Received: 30 October 2022
Published: 29 December 2022
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| PACS: |
74.25.Jb
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(Electronic structure (photoemission, etc.))
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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74.70.Xa
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(Pnictides and chalcogenides)
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