Abstract
AbstractUltrafast intraband carrier relaxation in carbon nanotubes can be described by Carbon Nanotube Bloch Equations (CNBE) treating the Coulomb interaction beyond the Hartree‐Fock level to include carrier‐carrier scattering. We obtain equations of motion for carrier densities and two‐particle carrier correlations that are solved numerically. The complex non‐Markovian relaxation dynamics of hot electrons is calculated for various carbon nanotubes of different diameter and chirality. All calculated nanotubes show an ultrafast relaxation to equilibrium within approximately 100 femtoseconds. The observed relaxation is only weakly dependent on chirality, but depends on the diameter of the nanotube. With increasing diameter of the CNT the relaxation is slowed down, because of the weaker Coulomb interaction in larger diameter CNT. Additionally, we find oscillations of the electron plasma that are due to memory effects in the electron equilibration. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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