Mirage Andreev Spectra Generated by Mesoscopic Leads in Nanowire Quantum Dots

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 repli...

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Detalles Bibliográficos
Autores: Su, Z., Zarassi, A., Hsu, J.-F., San-Jose, Pablo, Prada, E., Aguado, R., Lee, Eduardo Jian Hua, 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.
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/685851
Acceso en línea:http://hdl.handle.net/10486/685851
https://dx.doi.org/10.1103/PhysRevLett.121.127705
Access Level:acceso abierto
Palabra clave:Andreev
InSb nanowire quantum
NbTiN/InSb devices
Spectra
Dot
Mirage
Física
Descripción
Sumario: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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