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Proximity-induced superconductivity in epitaxial topological insulator/graphene/gallium heterostructures.
Li, Cequn; Zhao, Yi-Fan; Vera, Alexander; Lesser, Omri; Yi, Hemian; Kumari, Shalini; Yan, Zijie; Dong, Chengye; Bowen, Timothy; Wang, Ke; Wang, Haiying; Thompson, Jessica L; Watanabe, Kenji; Taniguchi, Takashi; Reifsnyder Hickey, Danielle; Oreg, Yuval; Robinson, Joshua A; Chang, Cui-Zu; Zhu, Jun.
Afiliación
  • Li C; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Zhao YF; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Vera A; Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA, USA.
  • Lesser O; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
  • Yi H; Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel.
  • Kumari S; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Yan Z; Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA, USA.
  • Dong C; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
  • Bowen T; Department of Physics, The Pennsylvania State University, University Park, PA, USA.
  • Wang K; 2-Dimensional Crystal Consortium, The Pennsylvania State University, University Park, PA, USA.
  • Wang H; Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA, USA.
  • Thompson JL; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
  • Watanabe K; Materials Research Institute, The Pennsylvania State University, University Park, PA, USA.
  • Taniguchi T; Materials Research Institute, The Pennsylvania State University, University Park, PA, USA.
  • Reifsnyder Hickey D; Department of Chemistry, The Pennsylvania State University, University Park, PA, USA.
  • Oreg Y; Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan.
  • Robinson JA; International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan.
  • Chang CZ; Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA.
  • Zhu J; Materials Research Institute, The Pennsylvania State University, University Park, PA, USA.
Nat Mater ; 22(5): 570-575, 2023 May.
Article en En | MEDLINE | ID: mdl-36781950
ABSTRACT
The introduction of superconductivity to the Dirac surface states of a topological insulator leads to a topological superconductor, which may support topological quantum computing through Majorana zero modes1,2. The development of a scalable material platform is key to the realization of topological quantum computing3,4. Here we report on the growth and properties of high-quality (Bi,Sb)2Te3/graphene/gallium heterostructures. Our synthetic approach enables atomically sharp layers at both hetero-interfaces, which in turn promotes proximity-induced superconductivity that originates in the gallium film. A lithography-free, van der Waals tunnel junction is developed to perform transport tunnelling spectroscopy. We find a robust, proximity-induced superconducting gap formed in the Dirac surface states in 5-10 quintuple-layer (Bi,Sb)2Te3/graphene/gallium heterostructures. The presence of a single Abrikosov vortex, where the Majorana zero modes are expected to reside, manifests in discrete conductance changes. The present material platform opens up opportunities for understanding and harnessing the application potential of topological superconductivity.
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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: 2023 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: 2023 Tipo del documento: Article País de afiliación: Estados Unidos