Gate-variable light absorption and emission in a semiconducting carbon nanotube.
We investigate the gate field dependence of light absorption and emission of an individual, suspended semiconducting carbon nanotube using Raman and photoluminescence spectroscopies. We find a strong reduction in the absorption strength and a red shift of the E(33) state of the nanotube with increasing gate field. The photoluminescence from the E(11) state is quenched even stronger. We explain these observations in terms of field-doping and its effects on both the radiative and nonradiative decay rates of the excitons. Thus, gate field-induced doping constitutes an effective means of controlling the optical properties of carbon nanotube devices.
Steiner
Mathias
M
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA.
Freitag
Marcus
M
Perebeinos
Vasili
V
Naumov
Anton
A
Small
Joshua P
JP
Bol
Ageeth A
AA
Avouris
Phaedon
P