Fe 1+y Te x Se 1-x : a delicate and tunable Majorana material

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 m...

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Bibliographic Details
Published in:Chinese physics letters 2022-12
Main Authors: Yang, Fazhi, Phan, Giao Ngoc, Zhang, Renjie, Zhao, Jin, Li, Jiajun, Lu, Zouyouwei, Schneeloch, John, Zhong, Ruidan, Ma, Mingwei, Gu, Genda, Dong, Xiaoli, Qian, Tian, Ding, Hong
Format: Article
Language:English
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Summary: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. Basing 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 able to tune the topological transition via applying lattice strain or carrier doping.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/40/01/017401