Electric currents induced by twisted light in Quantum Rings.
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 microA; from an applied perspective, this opens new possibilities to the optical control of the magnetization in semiconductors.
Quinteiro
G F
GF
Departamento de Física J J Giambiagi, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón I, C1428EGA Ciudad de Buenos Aires, Argentina. gquinteiro@df.uba.ar
Berakdar
J
J
D003198:Computer Simulation; D004574:Electromagnetic Fields; D008027:Light; D008962:Models, Theoretical; D011789:Quantum Theory; D012399:Rotation; D012542:Scattering, Radiation