Open AccessPhonon band structure and electron-phonon interactions in Ga and Sb nanowires: a first-principles study
Author(s) -
Weifeng Sun,
Meicheng Li,
Zhao Liancheng
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.7291
Subject(s) - phonon , nanowire , condensed matter physics , brillouin zone , band gap , materials science , coupling (piping) , instability , electronic band structure , electron , physics , nanotechnology , quantum mechanics , metallurgy
We present first-principles calculations of the electronic and phonon band structure considering electron-phonon coupling in thin Ga and Sb nanowires. A full Brillouin zone analysis of the phonons is performed for the investigation of nanowire structural stability. The examined nanowires show instability while the wave vectors are away from the zone center. Compared with the usual Peierls distortion picture, the unstable transverse phonon modes induce a transition without electronic band-gap opening. Electron-phonon interaction yields orders-of-magnitude changes depending on the nanowire structure.