Laser-induced phonon amplification in a single-walled nanotubeFeng Peng
China Center of Advanced Science and Technology - P.O. Box 8730 Beijing 100080, PRC and Physics Department, Beijing University of Science and Technology Beijing 100083, PRC
received 8 July 2005; accepted in final form 2 November 2005
published online 25 November 2005
In this work, we present a phonon amplification effect occurring in a single-walled nanotube in the presence of a laser field. We calculate the rate of change of the phonon population and obtain the field strength threshold for achieving the phonon amplification. The optical phonon population is seen to increase nonlinearly provided the phonon growth rate is greater than the phonon loss. We find that the intense laser field can open a window of generating phonon amplification in the one-dimensional wave vector space parallel to the tube axis.
78.67.-n - Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures.
78.67.Ch - Nanotubes.
63.20.Kr - Phonon-electron and phonon-phonon interactions.
© EDP Sciences 2005