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Crossover from Ising- to Rashba-type superconductivity in epitaxial Bi2Se3/monolayer NbSe2 heterostructures.
Yi, Hemian; Hu, Lun-Hui; Wang, Yuanxi; Xiao, Run; Cai, Jiaqi; Hickey, Danielle Reifsnyder; Dong, Chengye; Zhao, Yi-Fan; Zhou, Ling-Jie; Zhang, Ruoxi; Richardella, Anthony R; Alem, Nasim; Robinson, Joshua A; Chan, Moses H W; Xu, Xiaodong; Samarth, Nitin; Liu, Chao-Xing; Chang, Cui-Zu.
Afiliación
  • Yi H; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Hu LH; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Wang Y; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Xiao R; Department of Physics, University of North Texas, Denton, TX, USA.
  • Cai J; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Hickey DR; Department of Physics, University of Washington, Seattle, WA, USA.
  • Dong C; Department of Chemistry, The Pennsylvania State University, University Park, PA, USA.
  • Zhao YF; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
  • Zhou LJ; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
  • Zhang R; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Richardella AR; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Alem N; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Robinson JA; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Chan MHW; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
  • Xu X; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
  • Samarth N; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Liu CX; Department of Physics, University of Washington, Seattle, WA, USA.
  • Chang CZ; Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA.
Nat Mater ; 21(12): 1366-1372, 2022 Dec.
Article en En | MEDLINE | ID: mdl-36302957
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.
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Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Nat Mater Asunto de la revista: CIENCIA / QUIMICA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Nat Mater Asunto de la revista: CIENCIA / QUIMICA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos