Monolayer Superconductivity and Tunable Topological Electronic Structure at the Fe(Te,Se)/Bi2Te3 Interface
Abstract
Abstract The interface between 2D topological Dirac states and an s ‐wave superconductor is expected to support Majorana‐bound states (MBS) that can be used for quantum computing applications. Realizing these novel states of matter and their applications requires control over superconductivity and spin‐orbit coupling to achieve spin‐momentum‐locked topological interface states (TIS) which are simultaneously superconducting. While signatures of MBS have been observed in the magnetic vortex cores of bulk FeTe 0.55 Se 0.45 , inhomogeneity and disorder from doping make these signatures unclear and inconsistent between vortices. Here superconductivity is reported in monolayer (ML) FeTe 1–y Se y (Fe(Te,Se)) grown on Bi 2 Te 3 by molecular beam epitaxy (MBE). Spin and angle‐resolved photoemission spectroscopy (SARPES) directly resolve the interfacial spin and electronic structure of Fe(Te,Se)/Bi 2 Te 3 heterostructures. For y = 0.25, the Fe(Te,Se) electronic structure is found to overlap with the Bi 2 Te 3 TIS and the desired spin‐momentum locking is not observed. In contrast, for y = 0.1, reduced inhomogeneity measured by scanning tunneling microscopy (STM) and a smaller Fe(Te,Se) Fermi surface with clear spin‐momentum locking in the topological states are found. Hence, it is demonstrated that the Fe(Te,Se)/Bi 2 Te 3 system is amore »
- Authors:
-
[1];
[1];
[1];
[1];
[1];
[1]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Rutgers Univ., Piscataway, NJ (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); US Army Research Office (ARO); National Science Foundation (NSF); Gordon and Betty Moore Foundation; USDOE
- OSTI Identifier:
- 1972579
- Alternate Identifier(s):
- OSTI ID: 1983445
- Grant/Contract Number:
- AC05-00OR22725; W911NF2010108; DMR2004125; GBMF10104
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Materials
- Additional Journal Information:
- Journal Volume: 35; Journal Issue: 22; Journal ID: ISSN 0935-9648
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; superconductor; topological superconductor; monolayer superconductivity; molecular beam epitaxy; thin film heterostructure; spin and angle resolved photoemission spectroscopy; scanning tunneling microscopy
Citation Formats
Moore, Robert G., Lu, Qiangsheng, Jeon, Hoyeon, Yao, Xiong, Smith, Tyler, Pai, Yun‐Yi, Chilcote, Michael, Miao, Hu, Okamoto, Satoshi, Li, An‐Ping, Oh, Seongshik, and Brahlek, Matthew. Monolayer Superconductivity and Tunable Topological Electronic Structure at the Fe(Te,Se)/Bi2Te3 Interface. United States: N. p., 2023.
Web. doi:10.1002/adma.202210940.
Moore, Robert G., Lu, Qiangsheng, Jeon, Hoyeon, Yao, Xiong, Smith, Tyler, Pai, Yun‐Yi, Chilcote, Michael, Miao, Hu, Okamoto, Satoshi, Li, An‐Ping, Oh, Seongshik, & Brahlek, Matthew. Monolayer Superconductivity and Tunable Topological Electronic Structure at the Fe(Te,Se)/Bi2Te3 Interface. United States. https://doi.org/10.1002/adma.202210940
Moore, Robert G., Lu, Qiangsheng, Jeon, Hoyeon, Yao, Xiong, Smith, Tyler, Pai, Yun‐Yi, Chilcote, Michael, Miao, Hu, Okamoto, Satoshi, Li, An‐Ping, Oh, Seongshik, and Brahlek, Matthew. Wed .
"Monolayer Superconductivity and Tunable Topological Electronic Structure at the Fe(Te,Se)/Bi2Te3 Interface". United States. https://doi.org/10.1002/adma.202210940. https://www.osti.gov/servlets/purl/1972579.
@article{osti_1972579,
title = {Monolayer Superconductivity and Tunable Topological Electronic Structure at the Fe(Te,Se)/Bi2Te3 Interface},
author = {Moore, Robert G. and Lu, Qiangsheng and Jeon, Hoyeon and Yao, Xiong and Smith, Tyler and Pai, Yun‐Yi and Chilcote, Michael and Miao, Hu and Okamoto, Satoshi and Li, An‐Ping and Oh, Seongshik and Brahlek, Matthew},
abstractNote = {Abstract The interface between 2D topological Dirac states and an s ‐wave superconductor is expected to support Majorana‐bound states (MBS) that can be used for quantum computing applications. Realizing these novel states of matter and their applications requires control over superconductivity and spin‐orbit coupling to achieve spin‐momentum‐locked topological interface states (TIS) which are simultaneously superconducting. While signatures of MBS have been observed in the magnetic vortex cores of bulk FeTe 0.55 Se 0.45 , inhomogeneity and disorder from doping make these signatures unclear and inconsistent between vortices. Here superconductivity is reported in monolayer (ML) FeTe 1–y Se y (Fe(Te,Se)) grown on Bi 2 Te 3 by molecular beam epitaxy (MBE). Spin and angle‐resolved photoemission spectroscopy (SARPES) directly resolve the interfacial spin and electronic structure of Fe(Te,Se)/Bi 2 Te 3 heterostructures. For y = 0.25, the Fe(Te,Se) electronic structure is found to overlap with the Bi 2 Te 3 TIS and the desired spin‐momentum locking is not observed. In contrast, for y = 0.1, reduced inhomogeneity measured by scanning tunneling microscopy (STM) and a smaller Fe(Te,Se) Fermi surface with clear spin‐momentum locking in the topological states are found. Hence, it is demonstrated that the Fe(Te,Se)/Bi 2 Te 3 system is a highly tunable platform for realizing MBS where reduced doping can improve characteristics important for Majorana interrogation and potential applications.},
doi = {10.1002/adma.202210940},
journal = {Advanced Materials},
number = 22,
volume = 35,
place = {United States},
year = {Wed Mar 15 00:00:00 EDT 2023},
month = {Wed Mar 15 00:00:00 EDT 2023}
}
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