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arXiv · 1711.05432

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

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

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.

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Bum-Kyu Kim, Sang-Jun Choi, Jae Cheol Shin, Minsoo Kim, Ye-Hwan Ahn, H. -S. Sim, Ju-Jin Kim, Myung-Ho Bae. 2017-11-19. Transport spectroscopy for Paschen-Back splitting of Landau levels in InAs nanowires. https://arxiv.org/abs/1711.05432

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