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

G. F. Quinteiro and P. I. Tamborenea
Phys. Rev. B 79, 155450 – Published 30 April 2009

Abstract

We theoretically investigate the absorption and emission of light carrying orbital angular momentum (twisted light) by quasi-two-dimensional (disk-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 states 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 dot 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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  • Received 22 October 2008

DOI:https://doi.org/10.1103/PhysRevB.79.155450

©2009 American Physical Society

Authors & Affiliations

G. F. Quinteiro and P. I. Tamborenea

  • Departamento de Física “Juan José Giambiagi,” Universidad de Buenos Aires, Ciudad Universitaria, Pabellón I, 1428 Ciudad de Buenos Aires, Argentina

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Issue

Vol. 79, Iss. 15 — 15 April 2009

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