Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states

A Majorana look-alike Most experimental claims of bound states, unusual quasiparticles that may become the cornerstone topological quantum computing, rest on observation a persistent zero bias peak (ZBP) in tunneling spectra. In semiconductor–superconductor heterostructures, this feature also be caused by topologically trivial Andreev states. Valentini et al. provide comprehensive evidence ZBPs observed their experiments with semiconductor nanowires fully coated superconducting shell are indeed origin, contrast to interpretation similar earlier experiments. The researchers identify length tunnel junction devices as crucial parameter. Science , abf1513, issue p. 82