SELF-CONSISTENT MULTICOMPONENT ENVELOPE FUNCTION CALCULATION OF NORMAL INCIDENCE 2ND-HARMONIC GENERATION IN P-TYPE DOPED SYMMETRICAL QUANTUM-WELLS

In a self-consistent multicomponent envelope function approach, we sho wed that chi(xxx)((2)) component of the second-harmonic susceptibility tensor of a symmetric p-type quantum well (QW) exists, because of the valence-band mixing at nonzero values of the in-plane wave vector. Fo r a highly doped narrow GaAs/Al0.3Ga0.7As QW, our calculation indicate s that at low temperatures a large value (similar to 10(-7) m/V) of ch i(xxx)((2)) can be achieved in the far-infrared frequency range withou t satisfying double resonance conditions. This Value is comparable to the experimentally observed value of chi(zzz)((2)) in n-type asymmetri c QW structures. (C) 1997 American Institute of Physics.