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, M. Z. Hasan
DOI 10.1103/PhysRevB.90.085128 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
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