Energy band structure effect on the field-electron energy distribution from a single-walled carbon nanotube

The energy band structure effect on field emission energy distribution (FEED) from a single-walled carbon nanotube (SWNT) has been investigated theoretically. Both single-peak and multi-peak characteristics of FEED have been found, which positions correspond to the position of the peaks of density of state (DOS) except for the peak around the Fermi energy for a metallic nanotube. The number and the width of the peaks of FEED strongly depend on the applied field and temperature. Based on the FEED, we have also calculated the average energy of emitted electrons from SWNT.