The dynamics of a coherently driven localized exciton in a semiconducting single-wall carbon nanotube

The dynamics of a coherently driven localized exciton in a semiconducting single-wall carbon nanotube (SWNT) is investigated theoretically in terms of the perturbation treatment based on a unitary transformation. The decoherence rate of the exciton is obtained analytically and is compared with the one obtained with Born–Markov approximation. The results indicate that the decoherence strongly depends on the exciton–phonon coupling constant and the Rabi frequency of the coherently driving field. Furthermore, since the exciton–phonon coupling for SWNT is relatively strong and Born–Markov approximation becomes increasingly unreliable, we do need the numerically precise approach to treat the dynamics of the exciton in SWNT.