Large coherent acoustic-phonon oscillation observed in InGaN/GaN multiple-quantum wells
Journal
Applied Physics Letters
Journal Volume
75
Journal Issue
9
Pages
1249-1251
Date Issued
1999
Author(s)
Abstract
The large coherent acoustic-phonon oscillation in InGaN/GaN multiple quantum wells (MQW) is studied at room temperature on 14 periods. The oscillation is induced by the coupling between photogenerated carrier and the corresponding acoustic-phonon mode. After femtosecond pulse excitation from a Kerr-lens mode-locked Ti:sapphire laser, the photogenerated carriers screen out the strained-induced piezoelectric field and initiate the oscillation. Large optical property oscillation through the quantum-confined Stark effect results from the piezoelectric field modulation.
Other Subjects
Acoustooptical effects; Charge carriers; Phonons; Piezoelectricity; Semiconducting gallium compounds; Semiconducting indium compounds; Solid state lasers; Ultrafast phenomena; Acoustic-phonon oscillation; Gallium nitride; Indium gallium nitride; Quantum-confined Stark effect; Semiconductor quantum wells
Type
journal article