Ultrafast exciton transport in organic nanotubes

Abstract

The dynamics of exciton transport between the inner and outer walls of double-layer cylindrical aggregates is measured. Downhill transport is fast (275 fs) and excitation intensity independent. Uphill transport is much slower (3.5 ps), but this rate increases when the excitation density is raised. This suggests that exciton-exciton annihilation is involved.