Cold exciton electroluminescence from air-suspended carbon nanotube split-gate devices

摘要

Electroluminescence from individual carbon nanotubes within split-gatedevices is investigated. By characterizing the air-suspended nanotubes withphotoluminescence spectroscopy, chirality is identified and electroluminescencepeaks are assigned. We observe electroluminescence linewidth comparable tophotoluminescence, indicating negligible heating and state-mixing effects.Split-gate and bias voltage dependences are consistent with emission from anelectrostatically formed $pn$-junction.