Effect of strain on the polarization fluctuation of excitons in single-walled nanotubes
Physics Department, Beijing University of Science and Technology - Beijing 100083, China
Corresponding author: email@example.com
Accepted: 12 March 2010
We study the excitonic polarization in single-walled carbon nanotubes under the strain induced by a laser field. The time evolutions of the excitonic polarization and the polarization fluctuation are calculated under different strains by introducing a bosonization scheme for the low-energy excitation of an interacting electron-hole system. Our calculations show that under certain conditions excitons enter into squeezed states in which the polarization fluctuation is less than the one of the vacuum states. The strain can change not only the amplitude of the excitonic polarization fluctuation, but also the time domain in the squeezed states.
PACS: 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 42.50.Lc – Quantum fluctuations, quantum noise, and quantum jumps / 78.20.Bh – Theory, models, and numerical simulation
© EPLA, 2010