Temperature dependence of Andreev spectra in a superconducting carbon nanotube quantum dot
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Title:
Temperature dependence of Andreev spectra in a superconducting carbon nanotube quantum dot
Author:
Kumar, A.; Gaim, M.; Steininger, D.; Yeyati, A. Levy; Martín-Rodero, A.; Hüttel, A. K.; Strunk, C.
Entity:
UAM. Departamento de Física Teórica de la Materia Condensada
Publisher:
American Physical Society
Date:
2014-02-24
Citation:
10.1103/PhysRevB.89.075428
Physical Review B 89.7 (2014): 075428
ISSN:
1098-0121 (print); 1550-235X (online)
DOI:
10.1103/PhysRevB.89.075428
Funded by:
We gratefully acknowledge financial support from
the Deutsche Forschungsgemeinschaft within GRK 1570,
SFB 689, the E. Noether program (Hu 1808-1), from
Spanish MINECO through grant FIS2011-26516, and
from the EU FP7 Project SE2ND.
from the EU FP7 Project SE2ND. A. K. thanks the
Alexander von Humboldt Foundation for providing -
nancial support during this research
Project:
info:eu-repo/grantAgreement/EC/FP7/271554; Gobierno de España. FIS2011-26516
Editor's Version:
http://dx.doi.org/10.1103/PhysRevB.89.075428
Subjects:
Spectroscopy; Superconducting Anderson model; Física
Rights:
© 2014 American Physical Society
Abstract:
Tunneling spectroscopy of a Nb coupled carbon nanotube quantum dot reveals the formation of
pairs of Andreev bound states (ABS) within the superconducting gap. A weak replica of the lower
ABS is found, which is generated by quasi-particle tunnelling from the ABS to the Al tunnel probe.
An inversion of the ABS-dispersion is observed at elevated temperatures, which signals the thermal
occupation of the upper ABS. Our experimental findings are well supported by model calculations
based on the superconducting Anderson model
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