Crossover from Ising- to Rashba-type superconductivity in epitaxial Bi2Se3/monolayer NbSe2 heterostructures

Hemian Yi; Lun Hui Hu; Yuanxi Wang; Run Xiao; Jiaqi Cai; Danielle Reifsnyder Hickey; Chengye Dong; Yi Fan Zhao; Ling Jie Zhou; Ruoxi Zhang; Anthony R. Richardella; Nasim Alem; Joshua A. Robinson; Moses H.W. Chan; Xiaodong Xu; Nitin Samarth; Chao Xing Liu; Cui Zu Chang

doi:10.1038/s41563-022-01386-z

Crossover from Ising- to Rashba-type superconductivity in epitaxial Bi₂Se₃/monolayer NbSe₂ heterostructures

Hemian Yi, Lun Hui Hu, Yuanxi Wang, Run Xiao, Jiaqi Cai, Danielle Reifsnyder Hickey, Chengye Dong, Yi Fan Zhao, Ling Jie Zhou, Ruoxi Zhang, Anthony R. Richardella, Nasim Alem, Joshua A. Robinson, Moses H.W. Chan, Xiaodong Xu, Nitin Samarth, Chao Xing Liu, Cui Zu Chang

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34 Scopus citations

Abstract

A topological insulator (TI) interfaced with an s-wave superconductor has been predicted to host topological superconductivity. Although the growth of epitaxial TI films on s-wave superconductors has been achieved by molecular-beam epitaxy, it remains an outstanding challenge for synthesizing atomically thin TI/superconductor heterostructures, which are critical for engineering the topological superconducting phase. Here we used molecular-beam epitaxy to grow Bi₂Se₃ films with a controlled thickness on monolayer NbSe₂ and performed in situ angle-resolved photoemission spectroscopy and ex situ magnetotransport measurements on these heterostructures. We found that the emergence of Rashba-type bulk quantum-well bands and spin-non-degenerate surface states coincides with a marked suppression of the in-plane upper critical magnetic field of the superconductivity in Bi₂Se₃/monolayer NbSe₂ heterostructures. This is a signature of a crossover from Ising- to Rashba-type superconducting pairings, induced by altering the Bi₂Se₃ film thickness. Our work opens a route for exploring a robust topological superconducting phase in TI/Ising superconductor heterostructures.

Original language	English (US)
Pages (from-to)	1366-1372
Number of pages	7
Journal	Nature Materials
Volume	21
Issue number	12
DOIs	https://doi.org/10.1038/s41563-022-01386-z
State	Published - Dec 2022

All Science Journal Classification (ASJC) codes

General Chemistry
General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1038/s41563-022-01386-z

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Yi, H., Hu, L. H., Wang, Y., Xiao, R., Cai, J., Hickey, D. R., Dong, C., Zhao, Y. F., Zhou, L. J., Zhang, R., Richardella, A. R., Alem, N., Robinson, J. A., Chan, M. H. W., Xu, X., Samarth, N., Liu, C. X., & Chang, C. Z. (2022). Crossover from Ising- to Rashba-type superconductivity in epitaxial Bi₂Se₃/monolayer NbSe₂ heterostructures. Nature Materials, 21(12), 1366-1372. https://doi.org/10.1038/s41563-022-01386-z

@article{82734e67e42b4ca7a1efc1ceeb218a14,

title = "Crossover from Ising- to Rashba-type superconductivity in epitaxial Bi2Se3/monolayer NbSe2 heterostructures",

abstract = "A topological insulator (TI) interfaced with an s-wave superconductor has been predicted to host topological superconductivity. Although the growth of epitaxial TI films on s-wave superconductors has been achieved by molecular-beam epitaxy, it remains an outstanding challenge for synthesizing atomically thin TI/superconductor heterostructures, which are critical for engineering the topological superconducting phase. Here we used molecular-beam epitaxy to grow Bi2Se3 films with a controlled thickness on monolayer NbSe2 and performed in situ angle-resolved photoemission spectroscopy and ex situ magnetotransport measurements on these heterostructures. We found that the emergence of Rashba-type bulk quantum-well bands and spin-non-degenerate surface states coincides with a marked suppression of the in-plane upper critical magnetic field of the superconductivity in Bi2Se3/monolayer NbSe2 heterostructures. This is a signature of a crossover from Ising- to Rashba-type superconducting pairings, induced by altering the Bi2Se3 film thickness. Our work opens a route for exploring a robust topological superconducting phase in TI/Ising superconductor heterostructures.",

author = "Hemian Yi and Hu, {Lun Hui} and Yuanxi Wang and Run Xiao and Jiaqi Cai and Hickey, {Danielle Reifsnyder} and Chengye Dong and Zhao, {Yi Fan} and Zhou, {Ling Jie} and Ruoxi Zhang and Richardella, {Anthony R.} and Nasim Alem and Robinson, {Joshua A.} and Chan, {Moses H.W.} and Xiaodong Xu and Nitin Samarth and Liu, {Chao Xing} and Chang, {Cui Zu}",

note = "Publisher Copyright: {\textcopyright} 2022, The Author(s), under exclusive licence to Springer Nature Limited.",

year = "2022",

month = dec,

doi = "10.1038/s41563-022-01386-z",

language = "English (US)",

volume = "21",

pages = "1366--1372",

journal = "Nature Materials",

issn = "1476-1122",

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Yi, H, Hu, LH, Wang, Y, Xiao, R, Cai, J, Hickey, DR, Dong, C, Zhao, YF, Zhou, LJ, Zhang, R, Richardella, AR , Alem, N , Robinson, JA, Chan, MHW, Xu, X, Samarth, N , Liu, CX & Chang, CZ 2022, 'Crossover from Ising- to Rashba-type superconductivity in epitaxial Bi₂Se₃/monolayer NbSe₂ heterostructures', Nature Materials, vol. 21, no. 12, pp. 1366-1372. https://doi.org/10.1038/s41563-022-01386-z

TY - JOUR

T1 - Crossover from Ising- to Rashba-type superconductivity in epitaxial Bi2Se3/monolayer NbSe2 heterostructures

AU - Yi, Hemian

AU - Hu, Lun Hui

AU - Wang, Yuanxi

AU - Xiao, Run

AU - Cai, Jiaqi

AU - Hickey, Danielle Reifsnyder

AU - Dong, Chengye

AU - Zhao, Yi Fan

AU - Zhou, Ling Jie

AU - Zhang, Ruoxi

AU - Richardella, Anthony R.

AU - Alem, Nasim

AU - Robinson, Joshua A.

AU - Chan, Moses H.W.

AU - Xu, Xiaodong

AU - Samarth, Nitin

AU - Liu, Chao Xing

AU - Chang, Cui Zu

PY - 2022/12

Y1 - 2022/12

N2 - A topological insulator (TI) interfaced with an s-wave superconductor has been predicted to host topological superconductivity. Although the growth of epitaxial TI films on s-wave superconductors has been achieved by molecular-beam epitaxy, it remains an outstanding challenge for synthesizing atomically thin TI/superconductor heterostructures, which are critical for engineering the topological superconducting phase. Here we used molecular-beam epitaxy to grow Bi2Se3 films with a controlled thickness on monolayer NbSe2 and performed in situ angle-resolved photoemission spectroscopy and ex situ magnetotransport measurements on these heterostructures. We found that the emergence of Rashba-type bulk quantum-well bands and spin-non-degenerate surface states coincides with a marked suppression of the in-plane upper critical magnetic field of the superconductivity in Bi2Se3/monolayer NbSe2 heterostructures. This is a signature of a crossover from Ising- to Rashba-type superconducting pairings, induced by altering the Bi2Se3 film thickness. Our work opens a route for exploring a robust topological superconducting phase in TI/Ising superconductor heterostructures.

AB - A topological insulator (TI) interfaced with an s-wave superconductor has been predicted to host topological superconductivity. Although the growth of epitaxial TI films on s-wave superconductors has been achieved by molecular-beam epitaxy, it remains an outstanding challenge for synthesizing atomically thin TI/superconductor heterostructures, which are critical for engineering the topological superconducting phase. Here we used molecular-beam epitaxy to grow Bi2Se3 films with a controlled thickness on monolayer NbSe2 and performed in situ angle-resolved photoemission spectroscopy and ex situ magnetotransport measurements on these heterostructures. We found that the emergence of Rashba-type bulk quantum-well bands and spin-non-degenerate surface states coincides with a marked suppression of the in-plane upper critical magnetic field of the superconductivity in Bi2Se3/monolayer NbSe2 heterostructures. This is a signature of a crossover from Ising- to Rashba-type superconducting pairings, induced by altering the Bi2Se3 film thickness. Our work opens a route for exploring a robust topological superconducting phase in TI/Ising superconductor heterostructures.

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SN - 1476-1122

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JO - Nature Materials

JF - Nature Materials

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ER -

Crossover from Ising- to Rashba-type superconductivity in epitaxial Bi₂Se₃/monolayer NbSe₂ heterostructures

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