TY - JOUR
T1 - Two-photon four-wave mixing in III-V semiconductors
T2 - Evidence for coherent phonons
AU - Gur-Arie, I.
AU - Bar-Ad, Shimshon
PY - 2002/3/15
Y1 - 2002/3/15
N2 - We present midgap femtosecond four-wave mixing measurements on single-crystal GaAs and InP that show a surprising nondegenerate emission, shifted to higher energy relative to the laser, by an amount comparable to the energy of an optical phonon. The polarization dependence of the signal rules out ordinary Raman scattering. We discuss the possibility of impulsive excitation of symmetric lattice vibrations, around localized midgap states that may play a significant role in the two-photon transition amplitude.
AB - We present midgap femtosecond four-wave mixing measurements on single-crystal GaAs and InP that show a surprising nondegenerate emission, shifted to higher energy relative to the laser, by an amount comparable to the energy of an optical phonon. The polarization dependence of the signal rules out ordinary Raman scattering. We discuss the possibility of impulsive excitation of symmetric lattice vibrations, around localized midgap states that may play a significant role in the two-photon transition amplitude.
UR - http://www.scopus.com/inward/record.url?scp=0037085842&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.65.125311
DO - 10.1103/PhysRevB.65.125311
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AN - SCOPUS:0037085842
SN - 0163-1829
VL - 65
SP - 1253111
EP - 1253114
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 12
M1 - 125311
ER -