5 years ago

Transport spectroscopy for Paschen-Back splitting of Landau lev-els in InAs nanowires.

Jae Cheol Shin, Bum-Kyu Kim, Myung-Ho Bae, Ye-Hwan Ahn, Minsoo Kim, H.-S. Sim, Ju-Jin Kim, Sang-Jun Choi

The coupling of electron orbital motion and spin leads to nontrivial changes in 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 magnetic field. In solids, SOC generates energy-band inversion or splitting, a prerequisite for topological phases or Majorana fermions, at zero or weak magnetic fields. Here, we present the first observation of PB splitting of Landau levels (LLs) in indium arsenide nan-owires in a strong-field regime. Our energy-resolved transport spectroscopy results indicated the presence of LL-dependent anomalous Zeeman splitting in these nanowires, analogous to the atomic PB effect. This result was found to be in good agreement with a theoretical analysis based on Rashba SOC. Our findings also suggested a way of generating spin-resolved electron transport in nanowires.

Publisher URL: http://arxiv.org/abs/1711.05432

DOI: arXiv:1711.05432v1

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