Polarized photoluminescence from single wurtzite InP/InAs/InP core-multishell nanowires

The photoluminescence from single InP/InAs/InP core-multishell nanowires (CMNs) was highly linearly polarized in perpendicular to the nanowire long axis. Taking account of dielectric confinement of light field, we found the internal optical dipole squared perpendicular to the nanotube long axis d(0x)(2) is larger than that parallel to the axis d(0z)(2) by two orders of magnitude. With the increase in the thickness of InAs nanotubes, the ratio beta = d(0x)(2)/d(0z)(2) increases. This strong anisotropy in beta comes from nearly perfect wurtzite structure of InP/InAs/InP CMNs and small inclusion of p(z)-character into the Gamma(7)(B)-hole state. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3592855]