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InSb Nanowires with Built-In GaxIn1-xSb Tunnel Barriers for Majorana Devices

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arxiv 1611.05681 v2 pith:OXW4KPOS submitted 2016-11-17 cond-mat.mes-hall

InSb Nanowires with Built-In GaxIn1-xSb Tunnel Barriers for Majorana Devices

classification cond-mat.mes-hall
keywords tunnelbarriergaxin1-xsbmajoranabarriersdevicesheightinsb
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 GaxIn1-xSb 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 GaxIn1-xSb tunnel barrier are extracted from the Wentzel-Kramers-Brillouin (WKB)-fits to the experimental I-V traces.

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