TY  - JOUR
AU  - Bergfeld, S.
AU  - Daum, W.
TI  - Second-harmonic generation in GaAs : experiment verus theoretical predictions of X(2)xyz
JO  - Physical review letters
VL  - 90
SN  - 0031-9007
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-28933
SP  - 036801-1
PY  - 2003
N1  - Record converted from VDB: 12.11.2012
AB  - For GaAs we have determined \chi(xyz)((2))(-2omega; omega, omega)\ in second-harmonic generation experiments using two-photon energies between 2 and 5 eV. In addition to the E-1, E-1 + Delta(1), E-0', and E-2 critical-point bulk transitions of GaAs, a surprisingly strong surface transition at 3.35 eV was observed for natively oxidized GaAs(001) samples. A detailed comparison with theoretical predictions reveals that calculations that include many-particle effects at the level of the "scissors" approximation can describe the overall frequency dependence of the second-harmonic susceptibility reasonably well.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000180579200042
DO  - DOI:10.1103/PhysRevLett.90.036801
UR  - https://juser.fz-juelich.de/record/28933
ER  -