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