Conduction channels of superconducting quantum point contacts
Entidad
UAM. Departamento de Física Teórica de la Materia CondensadaEditor
ElsevierFecha de edición
2000-05-11Cita
10.1016/S0921-4526(99)01812-8
Physica B: Condensed Matter 280.1-4 (2000): 425-431
ISSN
0921-4526 (print); 1873-2135 (online)DOI
10.1016/S0921-4526(99)01812-8Financiado por
This work was supported in part by the Deutsche Forschungsgemeinschaft (DFG), Bureau National de Métrologie (BNM), and the Spanish CICYTVersión del editor
http://dx.doi.org/10.1016/S0921-4526(99)01812-8Materias
FísicaNota
This is the peer reviewed version of the following article: Physica B: Condensed Matter 280.1-4 (2000): 425-431, which has been published in final form at http://dx.doi.org/10.1016/S0921-4526(99)01812-8Derechos
© 2000 Elsevier Science B.V.Resumen
Atomic quantum point contacts accommodate a small number of conduction channels. Their number N and transmission coefficients {Tn} can be determined by analyzing the subgap structure due to multiple Andreev reflections in the current-voltage (I-V) characteristics in the superconducting state. With the help of mechanically controllable break-junctions we have produced Al contacts consisting of a small number of atoms. In the smallest stable contacts, usually three channels contribute to the transport. We show here that the channel ensemble {Tn} of few atom contacts remains unchanged up to temperatures and magnetic fields approaching the critical temperature and the critical field, respectively, giving experimental evidence for the prediction that the conduction channels are the same in the normal and in the superconducting state
Lista de ficheros
Google Scholar:Scheer, E.
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Cuevas Rodríguez, Juan Carlos
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Levy-Yeyati Mizrahi, Alfredo
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Martín-Rodero, A.
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Joyez, P.
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Devoret, M. H.
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Esteve, D.
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Urbina, C.
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