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Superconducting pairing of topological surface states in bismuth selenide films on niobium.
Flötotto, David; Ota, Yuichi; Bai, Yang; Zhang, Can; Okazaki, Kozo; Tsuzuki, Akihiro; Hashimoto, Takahiro; Eckstein, James N; Shin, Shik; Chiang, Tai-Chang.
Afiliación
  • Flötotto D; Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, IL 61801, USA.
  • Ota Y; Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, Japan.
  • Bai Y; Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, IL 61801, USA.
  • Zhang C; Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, IL 61801, USA.
  • Okazaki K; Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, Japan.
  • Tsuzuki A; Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, Japan.
  • Hashimoto T; Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, Japan.
  • Eckstein JN; Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, IL 61801, USA.
  • Shin S; Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, Japan.
  • Chiang TC; Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, IL 61801, USA.
Sci Adv ; 4(4): eaar7214, 2018 04.
Article en En | MEDLINE | ID: mdl-29719866
A topological insulator film coupled to a simple isotropic s-wave superconductor substrate can foster helical pairing of the Dirac fermions associated with the topological surface states. Experimental realization of such a system is exceedingly difficult, however using a novel "flip-chip" technique, we have prepared single-crystalline Bi2Se3 films with predetermined thicknesses in terms of quintuple layers (QLs) on top of Nb substrates fresh from in situ cleavage. Our angle-resolved photoemission spectroscopy (ARPES) measurements of the film surface disclose superconducting gaps and coherence peaks of similar magnitude for both the topological surface states and bulk states. The ARPES spectral map as a function of temperature and film thickness up to 10 QLs reveals key characteristics relevant to the mechanism of coupling between the topological surface states and the superconducting Nb substrate; the effective coupling length is found to be much larger than the decay length of the topological surface states.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Adv Año: 2018 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
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XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Adv Año: 2018 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos