Adiabatic charge pumping in carbon nanotube quantum dots.
We investigate charge pumping in carbon nanotube quantum dots driven by the electric field of a surface acoustic wave. We find that, at small driving amplitudes, the pumped current reverses polarity as the conductance is tuned through a Coulomb blockade peak using a gate electrode. We study the behavior as a function of wave amplitude, frequency, and direction and develop a model in which our results can be understood as resulting from adiabatic charge redistribution between the leads and quantum dots on the nanotube.
Buitelaar
M R
MR
Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
Kashcheyevs
V
V
Leek
P J
PJ
Talyanskii
V I
VI
Smith
C G
CG
Anderson
D
D
Jones
G A C
GA
Wei
J
J
Cobden
D H
DH