Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots
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- PRL108_GroveEtAl_2012
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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.
Originalsprog | Engelsk |
---|---|
Tidsskrift | Physical Review Letters |
Vol/bind | 108 |
Udgave nummer | 17 |
Sider (fra-til) | 176802 |
Antal sider | 5 |
ISSN | 0031-9007 |
DOI | |
Status | Udgivet - 26 apr. 2012 |
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