Electronic transitions in quantum dots and rings induced by inhomogeneous off-centered light beams

G. F. QUINTEIRO; P. I. TAMBORENEA; A O LUCERO

JOURNAL OF PHYSICS CONDENSED MATTER

IOP PUBLISHING LTD

Año: 2010 p. 505802 - 505808

0953-8984

We theoretically investigate the effect of inhomogeneous light beams with (twisted light) andwithout (plane-wave light) orbital angular momentum on semiconductor-based nanostructures,when the symmetry axes of the beam and the nanostructure are displaced parallel to each other.Exact analytical results are obtained by expanding the off-centered light field in terms of theappropriate light modes centered around the nanostructure. We demonstrate how electronictransitions involving the transfer of different amounts of orbital angular momentum areswitched on and off as a function of the separation between the axes of the beam and thesystem. In particular, we show that even off-centered plane-wave beams induce transitions suchthat the angular momenta of the initial and final states are different.