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The coupling of electron orbital motion and spin leads to nontrivial changesin energy-level structures, leading to various spectroscopies and applications.In atoms, such spin-orbit coupling (SOC) causes anomalous Zeeman splitting,known as the Paschen-Back (PB) effect, in the pres-ence of a strong magneticfield. In solids, SOC generates energy-band inversion or splitting, aprerequisite for topological phases or Majorana fermions, at zero or weakmagnetic fields. Here, we present the first observation of PB splitting ofLandau levels (LLs) in indium arsenide nan-owires in a strong-field regime. Ourenergy-resolved transport spectroscopy results indicated the presence ofLL-dependent anomalous Zeeman splitting in these nanowires, analogous to theatomic PB effect. This result was found to be in good agreement with atheoretical analysis based on Rashba SOC. Our findings also suggested a way ofgenerating spin-resolved electron transport in nanowires.

Transport spectroscopy for Paschen-Back splitting of Landau levels in InAs nanowires