Mirage Andreev Spectra Generated by Mesoscopic Leads in Nanowire Quantum Dots
Entity
UAM. Departamento de Física de la Materia Condensada; UAM. Centro de Investigación en Fisica de la Materia Condensada (IFIMAC); UAM. Instituto Universitario de Ciencia de Materiales Nicolás Cabrera (INC)Publisher
American Physical SocietyDate
2018-09-20Citation
10.1103/PhysRevLett.121.127705
Physical Review Letters 121.12 (2018) 127705
ISSN
0031-9007 (print); 1079-7114 (online)DOI
10.1103/PhysRevLett.121.127705Funded by
S. M. F. is supported by NSF DMR-1743972, ONR, and ARO. C. J. P. and S.M. F. acknowledge NSF PIRE-1743717. R. A., P.S-J., and E. P. acknowledge support from the Spanish Ministry of Economy and Competitiveness through Grants No. FIS2015-64654-P (MINECO/FEDER), No. FIS2015-65706-P (MINECO/FEDER), and No. FIS2016-80434-P (AEI/FEDER, EU), and the Ramón y Cajal programme Grant No. RYC-2011-09345. E. J. H. L. acknowledges ERC Grant No. 716559, the Maria de Maeztu programme for Units of Excellence in R&D (MDM-2014–0377), and the Ramón y Cajal programme (RYC-2015-17973)Project
Gobierno de España. FIS2015-64654-P; Gobierno de España. FIS2015-65706-P; Gobierno de España. FIS2016-80434-P; Gobierno de España. RYC-2011-09345; Gobierno de España. RYC-2015-17973Editor's Version
https://doi.org/10.1103/PhysRevLett.121.127705Subjects
Andreev; InSb nanowire quantum; NbTiN/InSb devices; Spectra; Dot; Mirage; FísicaRights
© 2018 American Physical SocietyAbstract
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
Files in this item
Google Scholar:Su, Z.
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Zarassi, A.
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Hsu, J.-F.
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San-Jose, Pablo
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Prada, E.
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Aguado, R.
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Lee, Eduardo Jian Hua
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Gazibegovic, S.
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Op het Veld, R. L. M.
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Car, D.
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Plissard, S. R.
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Hocevar, M.
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Pendharkar, M.
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Lee, J. S.
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Logan, J. A.
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Palmstrøm, C. J.
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Bakkers, E. P. A. M.
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Frolov, S. M.
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