CaltechAUTHORS
Published March 27, 2020 | Version Supplemental Material + Submitted
Journal Article Open

Type-II Ising pairing in few-layer stanene

Creators

  • 1. ROR icon Max Planck Institute for Solid State Research
  • 2. ROR icon Tsinghua University
  • 3. ROR icon RIKEN Center for Emergent Matter Science
  • 4. ROR icon Peking University
  • 5. ROR icon Beijing Normal University

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.

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).

Attached Files

Submitted - 1903.07627.pdf

Supplemental Material - aax3873-Falson-SM.pdf

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1903.07627.pdf

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Additional details

Identifiers

Eprint ID
102200
Resolver ID
CaltechAUTHORS:20200331-120907369

Related works

Describes
https://arxiv.org/abs/1903.07627 (URL)

Funding

National Natural Science Foundation of China
11790311
National Natural Science Foundation of China
11922409
National Natural Science Foundation of China
11674028
National Natural Science Foundation of China
51788104
Ministry of Science and Technology (Taipei)
2017YFA0304600
Ministry of Science and Technology (Taipei)
2017YFA0302902
Ministry of Science and Technology (Taipei)
2017YFA0303301
Ministry of Science and Technology (Taipei)
2018YFA0307100
Ministry of Science and Technology (Taipei)
2018YFA0305603
Ministry of Science and Technology (Taipei)
2016YFA0301001
Beijing Advanced Innovation Center for Future Chip (ICFC)

Dates

Created
2020-03-31
Created from EPrint's datestamp field
Updated
2021-11-16
Created from EPrint's last_modified field