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• 作者：Diana CarSonia Conesa-Boj ; Hao Zhang ; Roy L. M. Op het Veld ; Michiel W. A. de Moor ; Elham M. T. Fadaly ; Önder Gül ; Sebastian Kölling ; Sebastien R. Plissard ; Vigdis Toresen ; Michael T. Wimmer ; Kenji Watanabe ; Takashi TaniguchiLeo P. Kouwenhoven ; Erik P. A. M. Bakkers
• 刊名：Nano Letters
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：17
• 期：2
• 页码：721-727
• 全文大小：478K
• ISSN：1530-6992

文摘

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_xIn_1–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 Ga_xIn_1–xSb tunnel barrier are extracted from the Wentzel–Kramers-Brillouin (WKB) fits to the experimental I–V traces.