Link between superconductivity and a Lifshitz transition in intercalated BiSe

ORAL

Abstract

In a topological superconductor the bulk of the sample is fully gapped while a topologically protected gapless state resides on the surface. Intercalation of Cu, Sr or Nb between the quintuple layers of the topological insulator Bi2Se3 increases the carrier concentration and leads to superconductivity. It was suggested that the superconducting state in these compounds is topological. Here we study the electronic structure of Sr-intercalated Bi2Se3 using angle resolved photoemission spectroscopy (ARPES) and Shubnikov-de Haas (SdH) oscillations. We show that despite the relatively low Hall number, the carrier density is large and the resulting Fermi surface is cylindrical-type. We suggest that superconductivity in intercalated Bi2Se3 is more likely in such quasi-2D open Fermi surface.

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Presenters

  • Shay Sandik

    • Department of Condensed Matter Physics, Tel Aviv University, Tel Aviv, 6997801, Israel

Authors

  • Shay Sandik

    • Department of Condensed Matter Physics, Tel Aviv University, Tel Aviv, 6997801, Israel

  • Itai Silber

    • Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University
    • Department of Condensed Matter Physics, Tel Aviv University, Tel Aviv, 6997801, Israel
    • Tel Aviv University

  • Avior Almoalem

    • Physics Department, Technion-Israel Institute of Technology
    • Department of Physics, Technion -- Israel Institute of Technology, Haifa, 32000, Israel

  • Amit Ribak

    • Department of Physics, Technion -- Israel Institute of Technology, Haifa, 32000, Israel

  • Yuval Nitzav

    • Department of Physics, Technion -- Israel Institute of Technology, Haifa, 32000, Israel

  • Alexander Kuntsevich

    • P.N. Lebedev Physical institute of the RAS, Moscow, 119991, Russia

  • Oleg Sobolevskiy

    • P.N. Lebedev Physical institute of the RAS, Moscow, 119991, Russia

  • Yuriy Selivanov

    • P.N. Lebedev Physical institute of the RAS, Moscow, 119991, Russia

  • Valerii Prudkoglyad

    • P.N. Lebedev Physical institute of the RAS, Moscow, 119991, Russia

  • Yoram Dagan

    • Tel Aviv University
    • Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University
    • Department of Condensed Matter Physics, Tel Aviv University, Tel Aviv, 6997801, Israel

  • Amit Kanigel

    • Physics Department, Technion-Israel Institute of Technology
    • Department of Physics, Technion-Israel Institute of Technology
    • Department of Physics, Technion -- Israel Institute of Technology, Haifa, 32000, Israel