Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots
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- PRL108_GroveEtAl_2012
Submitted manuscript, 0.99 MB, PDF document
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 language | English |
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Journal | Physical Review Letters |
Volume | 108 |
Issue number | 17 |
Pages (from-to) | 176802 |
Number of pages | 5 |
ISSN | 0031-9007 |
DOIs | |
Publication status | Published - 26 Apr 2012 |
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ID: 41030017