Revealing the electronic structure of a carbon nanotube carrying a supercurrent - Physique Mésoscopique Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2010

Revealing the electronic structure of a carbon nanotube carrying a supercurrent

Résumé

Carbon nanotubes (CNTs) are not intrinsically superconducting but they can carry a supercurrent when connected to superconducting electrodes. This supercurrent is mainly transmitted by discrete entangled electron-hole states confined to the nanotube, called Andreev Bound States (ABS). These states are a key concept in mesoscopic superconductivity as they provide a universal description of Josephson-like effects in quantum-coherent nanostructures (e.g. molecules, nanowires, magnetic or normal metallic layers) connected to superconducting leads. We report here the first tunneling spectroscopy of individually resolved ABS, in a nanotube-superconductor device. Analyzing the evolution of the ABS spectrum with a gate voltage, we show that the ABS arise from the discrete electronic levels of the molecule and that they reveal detailed information about the energies of these levels, their relative spin orientation and the coupling to the leads. Such measurements hence constitute a powerful new spectroscopic technique capable of elucidating the electronic structure of CNT-based devices, including those with well-coupled leads. This is relevant for conventional applications (e.g. superconducting or normal transistors, SQUIDs) and quantum information processing (e.g. entangled electron pairs generation, ABS-based qubits). Finally, our device is a new type of dc-measurable SQUID.
Fichier principal
Vignette du fichier
NT-ABS-main.pdf (616.75 Ko) Télécharger le fichier
NT-ABS-SI.pdf (760.09 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Format : Autre

Dates et versions

hal-00480211 , version 1 (03-05-2010)
hal-00480211 , version 2 (27-07-2010)
hal-00480211 , version 3 (30-07-2010)

Identifiants

Citer

Jean-Damien Pillet, Charis Quay, Pascal Morfin, Cristina Bena, A. Levy Yeyati, et al.. Revealing the electronic structure of a carbon nanotube carrying a supercurrent. 2010. ⟨hal-00480211v1⟩

Collections

LPA LPA-MESO
612 Consultations
227 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More