Quinteiro G. F. and Berakdar J.

We theoretically investigate the generation of electric currents in quantum rings resulting from the optical excitation with twisted light. Our model describes the kinetics of electrons in a two-band model of a semiconductor-based mesoscopic quantum ring coupled to light having orbital angular momentum (twisted light). We find the analytical solution, which exhibits a ?circular? photon-drag effect and an induced magnetization, suggesting that this system is the circular analog of that of a bulk semiconductor excited by plane waves. For realistic values of the electric field and material parameters, the computed electric current can be as large as μA; from an applied perspective, this opens new possibilities to the optical control of the magnetization in semiconductors.

PDF (193kB)

(For personal use only. Please send an email to our secretary if you need the paper.)