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Semiconductor nanowires (NWs) have the prospect of being employed as basic units for nanoscale devices and circuits. However, the impact of their one-dimensional geometry and peculiar crystal phase on transport and spin characteristics remains largely unknown. We determine the exciton reduced mass and gyromagnetic factor of (InGa)As NWs in the wurtzite phase by photoluminescence (PL) spectroscopy under very high magnetic fields. For B perpendicular to the NW ĉ axis, the exciton reduced mass is 10% greater than that expected for the zincblende phase and no field-induced circular polarization of PL is observed. For B parallel to ĉ, an exciton reduced mass 35% greater than that of the zincblende phase is derived. Moreover, a circular dichroism of 70% is found at 28 T. Finally, an analysis of the PL line shape points at two Zeeman split levels, whose separation corresponds to an exciton …
American Chemical Society
Publication date: 
2 Dec 2013

Marta De Luca, Antonio Polimeni, Mario Capizzi, Alan J Meaney, Peter CM Christianen, Jan Kees Maan, Francesco Mura, Silvia Rubini, Faustino Martelli

Biblio References: 
Volume: 7 Issue: 12 Pages: 10717-10725
Acs Nano