Molecular-scale quantum dots from carbon nanotube heterojunctions.
Carbon nanotube heterojunctions (HJs), which seamlessly connect nanotubes of different chiral structure using a small number of atomic-scale defects, represent the ultimate scaling of electronic interfaces. Here we report the first electrical transport measurements on a HJ formed between semiconducting and metallic nanotubes of known chiralities. These measurements reveal asymmetric IV-characteristics and the presence of a quantum dot (QD) with approximately 60 meV charging energy and approximately 75 meV level spacing. A detailed atomistic and electronic model of the HJ enables the identification of specific defect arrangements that lead to the QD behavior consistent with the experiment.
Chandra
Bhupesh
B
Department of Mechanical Engineering, Center for Electronic Transport in Molecular Nanostructures, Columbia University, New York, New York 10027, USA.
Bhattacharjee
Joydeep
J
Purewal
Meninder
M
Son
Young-Woo
YW
Wu
Yang
Y
Huang
Mingyuan
M
Yan
Hugen
H
Heinz
Tony F
TF
Kim
Philip
P
Neaton
Jeffrey B
JB
Hone
James
J