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Su, Z; Zarassi, A; Hsu, J-F; San-Jose, P; Prada, E; Aguado, R; Lee, E J H; Gazibegovic, S; Op Het Veld, R L M; Car, D; Plissard, S R; Hocevar, M; Pendharkar, M; Lee, J S; Logan, J A; Palmstrøm, C J; Bakkers, E P A M; Frolov, S M
Physical review letters, 2018-Sep-21, Letnik: 121, Številka: 12Journal Article
We study transport mediated by Andreev bound states formed in InSb nanowire quantum dots. Two kinds of superconducting source and drain contacts are used: epitaxial Al/InSb devices exhibit a doubling of tunneling resonances, while, in NbTiN/InSb devices, Andreev spectra of the dot appear to be replicated multiple times at increasing source-drain bias voltages. In both devices, a mirage of a crowded spectrum is created. To describe the observations a model is developed that combines the effects of a soft induced gap and of additional Andreev bound states both in the quantum dot and in the finite regions of the nanowire adjacent to the quantum dot. Understanding of Andreev spectroscopy is important for the correct interpretation of Majorana experiments done on the same structures.
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in: SICRIS
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