Intermittency of excitonic polarization in single-walled carbon nanotubes induced by a weak laser fieldFeng Peng, Meng Qingchao and Zang Chunli
Physics Department, Beijing University of Science and Technology - Beijing 100083, China
received 3 August 2009; accepted in final form 13 November 2009; published December 2009
published online 11 December 2009
We investigate the time evolution of the excitonic polarization in semiconducting carbon nanotubes by a quantum theory, and present a modulation scheme of the excitonic polarization by applying a weak laser field. In calculation, we consider the many-body interaction between the electrons and the holes. Our results indicate that there is an intermittency of excitonic polarization. A correlation effect of the excitons induced by the weak laser field may be responsible for this phenomenon. We discuss the effect of the nanotube radius, laser field strength, and laser field frequency on the excitonic polarization.
73.20.Mf - Collective excitations (including excitons, polarons, plasmons and other charge-density excitations).
73.63.Fg - Nanotubes.
73.22.-f - Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals.
© EPLA 2009