(a) large-energy-scale d I / d V spectra on Bi₂Te₃/NbSe₂ heterostructures at indicated thicknesses. The red arrow points to the bulk conduction band of Bi₂Te₃, and the blue points to the valence band. (b) Small-energy-scale d I / d V spectra of Bi₂Te₃/NbSe₂ heterostructures at indicated thicknesses which reveal superconductivity persisting at up to 11 QL of Bi₂Te₃ thin films. (c) Abrikosov vortex lattice maps of NbSe₂ and 3-QL Bi₂Te₃ samples at 0.75-T magnetic field. All panels are reproduced from Ref. [121].