Determination of the spin orbit coupling and crystal field splitting in wurtzite InP by polarization resolved photoluminescence

摘要

Excitation photoluminescence spectroscopy is usually used to extract the crystal field splitting (DCR) and spin orbit coupling (DSO) parameters of wurtzite (Wz) InP nanowires (NWs). However, the equations expressing the valence band splitting are symmetric with respect to these two parameters, and a choice Delta(CR) Delta(SO) or Delta(CR) Delta(SO) has to be taken into account in order to assign the numerical values. To solve this issue, polarization resolved micro-photoluminescence was performed on vertically aligned and untapered Wz InP NWs grown on silicon. The experimental results combined with a theoretical model and finite difference time domain calculations allow us to conclude that Delta(CR) Delta(SO) in Wz InP. Published by AIP Publishing.