Tailoring exciton dynamics by elastic strain-gradient in semiconductors

Abstract

In purely bent ZnO microwires, the excitons can be effectively driven and concentrated by the elastic strain-gradient towards the tensile outer side of the purely bent wire. Experimental and theoretical approaches are combined to investigate the dynamics of excitons in an inhomogeneous strain field with a uniform elastic strain-gradient. Cathodoluminescence spectroscopy analysis on purely bent ZnO microwires verifies that excitons can be effectively driven and concentrated along the elastic strain-gradient.

Keywords: ZnO microwire; cathodoluminescence; exciton dynamics; pure bending; strain-gradient.