Field-enhanced photocurrent spectroscopy of excitonic states in single-wall carbon nanotubes.
Excitonic and free-carrier transitions in single-wall carbon nanotubes are distinguished using field-enhanced photocurrent spectroscopy. Electric field dissociation allows for the detection of bound-exciton states that otherwise would not contribute to the photocurrent. Excitonic states associated with both the ground-state semiconductor and the ground-state metallic nanotube transitions are resolved. The observation of a metallic excitonic state corroborates recent predictions of a symmetry gap existing in metallic nanotubes.
Mohite
Aditya
A
Department of Electrical and Computer Engineering, University of Louisville, Kentucky 40292, USA.
Lin
Ji-Tzuoh
JT
Sumanasekera
Gamini
G
Alphenaar
Bruce W
BW
D046529:Microscopy, Electron, Transmission; D037742:Nanotubes, Carbon; D010777:Photochemistry; D055585:Physical Phenomena; D010825:Physics; D013059:Spectrum Analysis, Raman
D037742:Nanotubes, Carbon