Topological Superconductivity (IMAGE)
Caption
Topological superconductivity and Majorana zero modes of epitaxial β-Bi2Pd films by molecular beam epitaxy. (a) Topographic image of β-Bi2Pd films, with the insert as the schematic crystal structure of β-Bi2Pd. (b) Typical differential conductance dI/dV spectrum at 0.4 K, revealing two distinct superconducting gaps from bulk (Δb) and topological surface (Δs) states, respectively. (c) Zero-bias conductance map, showing an individual magnetic vortex (bright yellow region). (d) Tunneling conductance dI/dV spectrum taken at the vortex center, signifying a salient zero bias conductance peak. (e) The dI/dV spectra acquired at positions with varying radial distance r from the vortex center. The peaks shows no splitting and is invariably fixed to the zero energy, anticipated for Majorana zero modes.
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