Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots
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Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots. / Grove-Rasmussen, Kasper; Grap, S.; Paaske, Jens; Flensberg, Karsten; Andergassen, Sabine; Meden, Volker; Jørgensen, Henrik Ingerslev; Muraki, K.; Fujisawa, T.
In: Physical Review Letters, Vol. 108, No. 17, 26.04.2012, p. 176802.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Magnetic-Field Dependence of Tunnel Couplings in Carbon Nanotube Quantum Dots
AU - Grove-Rasmussen, Kasper
AU - Grap, S.
AU - Paaske, Jens
AU - Flensberg, Karsten
AU - Andergassen, Sabine
AU - Meden, Volker
AU - Jørgensen, Henrik Ingerslev
AU - Muraki, K.
AU - Fujisawa, T.
PY - 2012/4/26
Y1 - 2012/4/26
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.108.176802
DO - 10.1103/PhysRevLett.108.176802
M3 - Journal article
VL - 108
SP - 176802
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 17
ER -
ID: 41030017