Falson, Joseph and Xu, Yong and Liao, Menghan and Zang, Yunyi and Zhu, Kejing and Wang, Chong and Zhang, Zetao and Liu, Hongchao and Duan, Wenhui and He, Ke and Liu, Haiwen and Smet, Jurgen H. and Zhang, Ding and Xue, Qi-Kun (2020) Type-II Ising pairing in few-layer stanene. Science, 367 (6485). pp. 1454-1457. ISSN 0036-8075. doi:10.1126/science.aax3873. https://resolver.caltech.edu/CaltechAUTHORS:20200331-120907369
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Abstract
Spin-orbit coupling has proven indispensable in the realization of topological materials and, more recently, Ising pairing in two-dimensional superconductors. This pairing mechanism relies on inversion symmetry–breaking and sustains anomalously large in-plane polarizing magnetic fields whose upper limit is predicted to diverge at low temperatures. Here, we show that the recently discovered superconductor few-layer stanene, epitaxially strained gray tin (α-Sn), exhibits a distinct type of Ising pairing between carriers residing in bands with different orbital indices near the Γ-point. The bands are split as a result of spin-orbit locking without the participation of inversion symmetry–breaking. The in-plane upper critical field is strongly enhanced at ultralow temperature and reveals the predicted upturn.
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| Additional Information: | © 2020 American Association for the Advancement of Science. Received 19 March 2019; accepted 27 February 2020. Published online 12 March 2020. We thank B. Friess for technical assistance and Y. Zhang for fruitful discussions. This work is financially supported by the National Natural Science Foundation of China (grants 11790311, 11922409, 11674028, and 51788104); the Ministry of Science and Technology of China (2017YFA0304600, 2017YFA0302902, 2017YFA0303301, 2018YFA0307100, 2018YFA0305603, and 2016YFA0301001); and the Beijing Advanced Innovation Center for Future Chip (ICFC). Author contributions: D.Z. conceived the project. J.F., D.Z., and M.L. performed the low-temperature electrical measurements. Y.Z., K.Z., and K.H. grew the samples. Y.X., C.W., Z.Z., and W.D. carried out first-principles calculations and theoretical analysis. Ha.L. derived the microscopic model of superconductivity with Ho.L.’s assistance. D.Z., J.F., Y.X., Ha.L., and J.H.S. analyzed the data and wrote the paper with input from Q.-K.X. All authors discussed the results and commented on the manuscript. The authors declare no competing interests. Data and materials availability: All data are available in (26). | ||||||||||||||||||||||||
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| Issue or Number: | 6485 | ||||||||||||||||||||||||
| DOI: | 10.1126/science.aax3873 | ||||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20200331-120907369 | ||||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20200331-120907369 | ||||||||||||||||||||||||
| Official Citation: | Type-II Ising pairing in few-layer stanene. BY JOSEPH FALSON, YONG XU, MENGHAN LIAO, YUNYI ZANG, KEJING ZHU, CHONG WANG, ZETAO ZHANG, HONGCHAO LIU, WENHUI DUAN, KE HE, HAIWEN LIU, JURGEN H. SMET, DING ZHANG, QI-KUN XUE. SCIENCE 27 MAR 2020 : 1454-1457; doi: 10.1126/science.aax3873 | ||||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||
| ID Code: | 102200 | ||||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||||||||||||||
| Deposited On: | 31 Mar 2020 19:19 | ||||||||||||||||||||||||
| Last Modified: | 16 Nov 2021 18:09 |
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