Volume 88, Number 5, December 2009
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 December 2009|
Intermittency of excitonic polarization in single-walled carbon nanotubes induced by a weak laser field
Physics Department, Beijing University of Science and Technology - Beijing 100083, China
Corresponding author: email@example.com
Accepted: 13 November 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.
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
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