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

Author(s): K. Grove-Rasmussen, S. Grap, J. Paaske, K. Flensberg, S. Andergassen, V. Meden, H.I. Jorgensen, K. Muraki, T. Fujisawa

Journal: Physical Review Letters

Volume: 108

Page(s): 176802

Year: 2012

DOI Number: 10.1103/PhysRevLett.108.176802

Link: Link to publication


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.


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