Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-05-14
Physics Letters A 372, 3517 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
We present a formalism for calculating the absorption coefficient of a pair of coaxial tubules. A spatially nonlocal, dynamical self-consistent field theory is obtained by calculating the electrostatic potential produced by the charge density fluctuations as well as the external electric field. There are peaks in the absorption spectrum arising from plasma excitations corresponding either to plasmon or particle-hole modes. In this paper, we numerically calculate the plasmon contribution to the absorption spectrum when an external electric field is applied. The number of peaks depends on the radius of the inner as well as outer tubule. The height of each peak is determined by the plasmon wavelength and energy. For a chosen wave number, the most energetic plasmon has the highest peak corresponding to the largest oscillator strength of the excited modes. Some of the low-frequency plasmon modes have such weak coupling to an external electric field that they are not seen on the same scale as the modes with larger energy of excitation. We plot the peak positions of the plasmon excitations for a pair of coaxial tubules. The coupled modes on the two tubules are split by the Coulomb interaction. The energies of the two highest plasmon branches increase with the radius of the outer tubule. On the contrary, the lowest modes decrease in energy as this radius is increased. No effects due to inter-tubule hopping are included in these calculations.
Balassis Antonios
Gumbs Godfrey
No associations
LandOfFree
Formula for the Absorption Coefficient for Multi-Wall Nanotubes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Formula for the Absorption Coefficient for Multi-Wall Nanotubes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Formula for the Absorption Coefficient for Multi-Wall Nanotubes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-518847