Simulation of field enhancement effects in carbon nanotubes

Simulations of electric field enhancement factor, /spl beta/, for isolated metallic carbon nanotubes (CNT) are reported. We show that /spl beta/ is dependent not only on the geometry of the tubes, but also on the location of the anode electrode. We also highlight the effect of field screening due to boundary conditions of the simulation package. Finally, we give an expression for /spl beta/ as a function of CNT height, radius, and anode to cathode separation.