Conductance Quantization at Zero Magnetic Field in InSb Nanowires
J. Kammhuber (TU Delft - QRD/Kouwenhoven Lab)
M. C. Cassidy (TU Delft - QRD/Kouwenhoven Lab)
Hao Zhang (TU Delft - QRD/Kouwenhoven Lab)
Önder Gül (TU Delft - QRD/Kouwenhoven Lab)
F. Pei (TU Delft - QN/Quantum Transport)
M.W.A. de Moor (TU Delft - QRD/Kouwenhoven Lab)
Bas Nijholt (TU Delft - QN/Akhmerov Group)
Kenji Watanabe (National Institute for Materials Science)
Takashi Taniguchi (National Institute for Materials Science)
D. Car (Eindhoven University of Technology)
SR Plissard (TU Delft - QN/Quantum Transport, Eindhoven University of Technology)
Erik P.A.M. Bakkers (TU Delft - QN/Bakkers Lab, Eindhoven University of Technology)
L. P. Kouwenhoven (TU Delft - QRD/Kouwenhoven Lab)
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Abstract
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 we study the contribution of orbital effects to the sub-band dispersion for different orientation of the magnetic field, observing a near-degeneracy between the second and third sub-bands.
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