Direct measurement of momentum relaxation time in wurtzite InN
Journal
Journal of Applied Physics
Journal Volume
102
Journal Issue
8
Pages
083540-1 - 083540-4
Date Issued
2007
Author(s)
Gwo, S.
Abstract
In this paper, we demonstrate that the momentum relaxation time of photoexcited carriers in wurtzite InN can be directly determined by investigating the rapid dephasing nature of coherent upper-branched longitudinal optical phonon-plasmon coupling (L+) mode. It is found that coherent L+ mode is a plasmonlike vibration mode and its dephasing time reduces from 120to60fs when the photoexcited carrier density increases from 2×1017∕cm3to2×1018∕cm3. The measured dephasing time is attributed to the momentum relaxation of photoexcited carriers, which is governed by the screened Coulomb interaction among photoexcited and background carriers in the bulk region of InN.
Publisher
American Institute of Physics
Type
journal article