Coherently controlled ballistic charge currents injected in single-walled carbon nanotubes and graphite.
Ballistic electrical currents are optically injected into aligned single-walled carbon nanotubes and bulk graphite at 300 K via quantum interference between single and two photon absorption of phase-related 700 and 1400 nm, 150 fs pulses. The transient currents are detected via the emitted terahertz radiation. Optical phase and power dependence are consistent with the quantum interference optical process. Under similar excitation conditions, the peak current for a forest of nanotubes, with a diameter distribution of approximately 2.5 +/- 1.5 nm, is 9 +/- 1 times larger than that in graphite. At peak focused intensities of 10 GW cm(-2) (1400 nm) and 0.15 GW cm(-2) (700 nm), the peak current is approximately 1 nA per nanotube. The peak current for pump light polarized along the tubes is approximately 3.5 times higher than that for light polarized perpendicular to the tubes.
Newson
Ryan W
RW
Department of Physics and Institute for Optical Sciences, University of Toronto, Toronto, ON, Canada.
Ménard
Jean-Michel
JM
Sames
Christian
C
Betz
Markus
M
van  Driel
Henry M
HM
D017097:Electric Impedance; D004574:Electromagnetic Fields; D006108:Graphite / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D008422:Materials Testing; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000528:radiation effects; D055672:Static Electricity
D037742:Nanotubes, Carbon; D006108:Graphite