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Magnetic-field dependence of tunnel couplings in carbon nanotube quantum dots
Authors:Grove-Rasmussen K  Grap S  Paaske J  Flensberg K  Andergassen S  Meden V  Jørgensen H I  Muraki K  Fujisawa T
Institution:NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Japan. k_grove@fys.ku.dk
Abstract: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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