Fig. 1 | Nature Communications

Fig. 1

From: Induced unconventional superconductivity on the surface states of Bi2Te3 topological insulator

Fig. 1

Morphological and transport characterization of a typical proximity based Bi2Te3 Josephson junction. a Scanning electron microscope image of a junction made using an exfoliated flake. The light blue areas define the Al/Pt electrodes while the Bi2Te3 flake is shown in yellow. Scale bar: 200 nm. b Atomic force microscope image of a Bi2Te3 thin film grown on GaAs substrate showing a typical growth with aligned pyramidal domains. Scale bar: 400 nm. c IVC of a typical junction (w = 1 µm, L = 200 nm) measured at 20 mK (cyan). The resistive branch shows a neat change of slope at a voltage V ≈ 260 μV (cyan arrow) that corresponds to ~2ΔAl for the thickness of the electrodes22. The black arrow indicates the value of the extracted excess current. d Cross section schematics of the effective device under consideration. The transport properties can be assimilated to those of a S′INIS′ Josephson junction where S′ represents the induced superconductor in the Bi2Te3

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