TY - JOUR
T1 - Theory of the dispersion of ultrafast nonlinear refraction in zinc-blende semiconductors below the band edge
AU - Hutchings, D. C.
AU - Wherrett, B. S.
PY - 1994
Y1 - 1994
N2 - The dispersion of the nonlinear refractive index of direct-gap semiconductors, over the full sub-band-gap spectral region, is determined within the four-band Kane model. The divergences of individual terms in the nonlinear susceptibility, which have prevented previous full calculations, are avoided by selecting suitable combinations of terms and by a consistent application of the analytic continuation technique. The origins of different forms of divergence are analyzed. Results are presented for InSb, InAs, GaAs, CdTe, ZnTe, and ZnSe; these are compared with previous model calculations based on a Kramers-Krönig transformation of the nonlinear absorptive susceptibilities. The present model gives excellent agreement, with no fitting parameters, to spectral midgap experimental results for the alloy Al0.18Ga0.82As. © 1994 The American Physical Society.
AB - The dispersion of the nonlinear refractive index of direct-gap semiconductors, over the full sub-band-gap spectral region, is determined within the four-band Kane model. The divergences of individual terms in the nonlinear susceptibility, which have prevented previous full calculations, are avoided by selecting suitable combinations of terms and by a consistent application of the analytic continuation technique. The origins of different forms of divergence are analyzed. Results are presented for InSb, InAs, GaAs, CdTe, ZnTe, and ZnSe; these are compared with previous model calculations based on a Kramers-Krönig transformation of the nonlinear absorptive susceptibilities. The present model gives excellent agreement, with no fitting parameters, to spectral midgap experimental results for the alloy Al0.18Ga0.82As. © 1994 The American Physical Society.
U2 - 10.1103/PhysRevB.50.4622
DO - 10.1103/PhysRevB.50.4622
M3 - Article
SN - 0163-1829
VL - 50
SP - 4622
EP - 4630
JO - Physical Review B: Condensed Matter
JF - Physical Review B: Condensed Matter
IS - 7
ER -