Gate-induced blueshift and quenching of photoluminescence in suspended   single-walled carbon nanotubes
  Gate-voltage effects on photoluminescence spectra of suspended single-walled carbon nanotubes are investigated. Photoluminescence microscopy and excitation spectroscopy are used to identify individual nanotubes and to determine their chiralities. Under an application of gate voltage, we observe slight blueshifts in the emission energy and strong quenching of photoluminescence. The blueshifts are similar for different chiralities investigated, suggesting extrinsic mechanisms. In addition, we find that the photoluminescence intensity quenches exponentially with gate voltage. 
S. Yasukochi, T. Murai, S. Moritsubo, T. Shimada, S. Chiashi, S.   Maruyama, Y. K. Kato
cond-mat.mes-hall