Electronic transitions in disc-shaped quantum dots induced by twisted light

Details Electronic transitions in disc-shaped quantum dots induced by twisted light Electronic transitions in disc-shaped quantum dots induced by twisted light

2008-10-22

arxiv.org/abs/0810.4156v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We theoretically investigate the absorption and emission of light carrying orbital angular momentum (twisted-light) by quasi-two-dimensional (disc-shaped) quantum dots in the presence of a static magnetic field. We calculate the transition matrix element for the light-matter interaction and use it to explore different scenarios, depending on the initial and final state of the electron undergoing the optically-induced transition. We make explicit the selection rule for the conservation of the z-projection of the orbital angular momentum. For a realistic set of parameters (quantum dots size, beam waist, photon energy, etc.) the strength of the transition induced by twisted light is 10% of that induced by plane-waves. Finally, our analysis indicates that it may be possible to select precisely the electronic level one wishes to populate using the appropriate combination of light-beam parameters suggesting technological applications to the quantum control of electronic states in quantum dots.

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