Field emission patterns from first-principles electronic structures: application to pristine and cesium-doped carbon nanotubes.
A general approach is introduced to calculate field emission properties of any kind of nanostructure based on the first-principles local density of states (LDOS) and effective potentials. The experimental field emission spectroscopy images are explained as LDOS at the structure-vacuum barrier, weighted by the probability of electron tunneling. The method excellently reproduces the experimental field emission patterns of pristine capped carbon nanotubes. We show that cesium adsorbates even with a low doping ratio of one dopant per nanotube increase the emission current around 2.5 times, due to a generated dipole field.
Khazaei
Mohammad
M
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan. khazaei@imr.edu
Farajian
Amir A
AA
Kawazoe
Yoshiyuki
Y