Polarized emission from hexagonal-silicon–germanium nanowires

We present polarized emission from single hexagonal silicon–germanium (hex-SiGe) nanowires. To understand the nature of band-to-band hex-SiGe, we have performed photoluminescence spectroscopy to investigate polarization properties hex-SiGe core–shell observe a degree 0.2 0.32 perpendicular nanowire c-axis. Finite-difference time-domain simulations were influence dielectric contrast structures. find that significantly reduces observable polarization. Taking into account this reduction, experimental data are in good agreement with dipole c-axis, as expected for fundamental transition, lowest energy direct transition band structure.