Influence of heterointerface atomic structure and defects on second-harmonic generation

Abstract

Second-harmonic spectroscopy is shown to be sensitive to interfacial electronic traps, lattice relaxation and buried surface reconstruction in ZnSe/GaAs(001) heterostructures. Newly developed photomodulation-second-harmonic-generation experiments reveal that the interfacial region contains predominantly hole traps, and that the density of these traps is substantially lower for 3\ifmmode\times\else\texttimes\fi{}1 buried surface reconstructed samples.