Issue
EPL
Volume 88, Number 5, December 2009
Article Number 57008
Number of page(s) 4
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/88/57008
Published online 11 December 2009
EPL, 88 (2009) 57008
DOI: 10.1209/0295-5075/88/57008

Intermittency of excitonic polarization in single-walled carbon nanotubes induced by a weak laser field

Feng Peng, Meng Qingchao and Zang Chunli

Physics Department, Beijing University of Science and Technology - Beijing 100083, China

fengpeng@sas.ustb.edu.cn

received 3 August 2009; accepted in final form 13 November 2009; published December 2009
published online 11 December 2009

Abstract
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.

PACS
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