Conduction band structure in wurtzite GaAs nanowires: A resonant Raman scattering study

摘要

We report on a room temperature Raman resonance at 1.56eV in GaAs wurtzite nanowires together with the emergence of a strong forbidden longitudinal optical phonon line. We attribute this resonance, absent in zinc blende wires with similar diameters, to an additional excitonic transition due to conduction band folding in agreement with recent theoretical predictions.