Quantum-Mechanical Investigation of Field-Emission Mechanism of a Micrometer-Long Single-Walled Carbon Nanotube
A quantum-mechanical simulation is carried out to investigate the charge distribution and electrostatic potential along a 1 μm long (5,5) single-walled carbon nanotube under realistic field-emission experimental conditions. A single layer of carbon atoms is found sufficient to shield most of the electric field except at the tip where strong field penetration occurs. The penetration leads to a nonlinear decrease of potential barrier for emission, which is equally responsible for the low threshold voltage besides the well-known geometrical field enhancement factor.
Physical Review Letters
- Pub Date:
- March 2004
- Electronic structure of nanoscale materials: clusters nanoparticles nanotubes and nanocrystals;
- Electron states and collective excitations in multilayers quantum wells mesoscopic and nanoscale systems;
- Field emission ionization evaporation and desorption