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2 results on '"de Moor MW"'

1. InSb Nanowires with Built-In Ga x In 1-x Sb Tunnel Barriers for Majorana Devices.

Author

Car D, Conesa-Boj S, Zhang H, Op Het Veld RL, de Moor MW, Fadaly EM, Gül Ö, Kölling S, Plissard SR, Toresen V, Wimmer MT, Watanabe K, Taniguchi T, Kouwenhoven LP, and Bakkers EP

Abstract

Majorana zero modes (MZMs), prime candidates for topological quantum bits, are detected as zero bias conductance peaks (ZBPs) in tunneling spectroscopy measurements. Implementation of a narrow and high tunnel barrier in the next generation of Majorana devices can help to achieve the theoretically predicted quantized height of the ZBP. We propose a material-oriented approach to engineer a sharp and narrow tunnel barrier by synthesizing a thin axial segment of Ga x In 1-x Sb within an InSb nanowire. By varying the precursor molar fraction and the growth time, we accurately control the composition and the length of the barriers. The height and the width of the Ga x In 1-x Sb tunnel barrier are extracted from the Wentzel-Kramers-Brillouin (WKB) fits to the experimental I-V traces.

Published
2017
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2. Conductance Quantization at Zero Magnetic Field in InSb Nanowires.

Author

Kammhuber J, Cassidy MC, Zhang H, Gül Ö, Pei F, de Moor MW, Nijholt B, Watanabe K, Taniguchi T, Car D, Plissard SR, Bakkers EP, and Kouwenhoven LP

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.

Published
2016
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