Ballistic electron transport is a key requirement for existence of a topological phase transition in proximitized InSb nanowires. However, measurements of quantized conductance as direct evidence of ballistic transport have so far been obscured due to the increased chance of backscattering in one dimensional nanowires. We show that by improving the nanowire-metal interface as well as the dielectric environment we can consistently achieve conductance quantization at zero magnetic field. Additionally, studying the sub-band evolution in a rotating magnetic field reveals an orbital degeneracy between the second and third sub-bands for perpendicular fields above 1T.
@article{arxiv.1603.03751,
title = {Conductance Quantization at zero magnetic field in InSb nanowires},
author = {Jakob Kammhuber and Maja C. Cassidy and Hao Zhang and Önder Gül and Fei Pei and Michiel W. A. de Moor and Bas Nijholt and Kenji Watanabe and Takashi Taniguchi and Diana Car and Sebastien R. Plissard and Erik P. A. M. Bakkers and Leo P. Kouwenhoven},
journal= {arXiv preprint arXiv:1603.03751},
year = {2016}
}