Title :
Optical vibrational states of diamond nanocrsytals
Author :
Serrano, F.A. ; De Rivera, L. Niño ; Ponomaryov, V. ; Cruz-Irisson, M.
Author_Institution :
ESIME-Culhuacan, Inst. Politec. Nac., Mexico City, Mexico
Abstract :
The phonon band structure and Raman response of diamond nanowires are calculated by means of the Born potential, including central and non-central interatomic forces, and a supercell model. The Raman scattering is studied by means of the local bond-polarization model based on the displacement-displacement Green´s function within the linear response theory. Free standing, infinitely long and homogeneous quantum wires cross sections with the wire axis along the [001] direction are considered. The results show an important shift of the main Raman peak (highest optical mode) towards lower energies, in comparison with the bulk crystalline diamond case.
Keywords :
Green´s function methods; Raman spectra; diamond; elemental semiconductors; nanowires; phonons; semiconductor quantum wires; Born potential; C; Raman response; Raman scattering; [001] direction; central interatomic forces; diamond nanocrsytals; diamond nanowires; displacement-displacement Green´s function; linear response theory; local bond-polarization model; noncentral interatomic forces; optical vibrational states; phonon band structure; quantum wires; supercell model; Atomic measurements; Biomedical optical imaging; Bonding; Diamond-like carbon; Green´s function methods; Nanowires; Optical scattering; Phonons; Raman scattering; Uncertainty; Diamond; Nanocrystals; Raman scattering;
Conference_Titel :
Circuits and Systems, 2009. MWSCAS '09. 52nd IEEE International Midwest Symposium on
Conference_Location :
Cancun
Print_ISBN :
978-1-4244-4479-3
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2009.5235903
