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Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots

Autor(en)
Kasper Grove-Rasmussen, Stephan Grap, Jens Paaske, Karsten Flensberg, Sabine Andergassen, Volker Meden, Henrik Ingerslev Jørgensen, Koji Muraki, Toshimasa Fujisawa
Abstrakt

By means of sequential and cotunneling spectroscopy, we study the tunnel couplings between metallic leads and individual levels in a carbon nanotube quantum dot. The levels are ordered in shells consisting of two doublets with strong- and weak-tunnel couplings, leading to gate-dependent level renormalization. By comparison to a one- and two-shell model, this is shown to be a consequence of disorder-induced valley mixing in the nanotube. Moreover, a parallel magnetic field is shown to reduce this mixing and thus suppress the effects of tunnel renormalization.

Organisation(en)
Quantenoptik, Quantennanophysik und Quanteninformation
Externe Organisation(en)
University of Copenhagen, Rheinisch-Westfälische Technische Hochschule Aachen, Nippon Telegraph and Telephone Corporation
Journal
Physical Review Letters
Band
108
Anzahl der Seiten
5
ISSN
0031-9007
DOI
https://doi.org/10.1103/PhysRevLett.108.176802
Publikationsdatum
2012
Peer-reviewed
Ja
ÖFOS 2012
103025 Quantenmechanik
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/ebd989af-566c-4007-8084-235dc8a3507d