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

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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.
Original languageEnglish
JournalPhysical Review Letters
Issue number17
Pages (from-to)176802
Number of pages5
Publication statusPublished - 26 Apr 2012

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