Fermi-level electronic structure of a topological-insulator/cuprate- superconductor based heterostructure in the superconducting proximity effect regime

Su Yang Xu, Chang Liu, Anthony Richardella, I. Belopolski, N. Alidoust, M. Neupane, G. Bian, Nitin Samarth, MD Zahid Hasan

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

We probe the near Fermi-level electronic structure of tunable topological-insulator (Bi2Se3)/cuprate-superconductor Bi2Sr2CaCu2O8+δ (Tc≃91K) heterostructures in their proximity-induced superconductivity regime. Our careful momentum space imaging provides clear evidence for a two-phase coexistence and a striking lack of any strong d-wave proximity effect expected in this system. Our Fermi surface imaging data identify key contributors in reducing the proximity-induced gap below the 5 meV or to a lower energy range (ΔBSCCO). These results correlate with our observation of momentum space separation between the Bi2Se3 and Bi2Sr2CaCu2O8+δ Fermi surface topologies and mismatch of lattice symmetries in addition to the presence of a small coherence length. These studies not only provide critical momentum space insights into the Bi2Se3/Bi2Sr2CaCu2O8+δ heterostructures, but also set an upper bound on the proximity-induced gap for realizing a much sought out Majorana fermion condition in this system.

Original languageEnglish (US)
Article number085128
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number8
DOIs
StatePublished - Aug 20 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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