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Abstract:

An optical vortex is an inhomogeneous light beam having a phase singularity at its axis, where the intensity of the electric and/or magnetic field may vanish. Already well studied are the paraxial beams, which may carry well-defined values of spin (polarization σ) and orbital angular momenta; the orbital angular momentum per photon is given by the topological charge times the Planck constant. Here we study the light hole-to-conduction band transitions in a semiconductor quantum dot induced by a highly focused beam originating from a =1 paraxial optical vortex. We find that at normal incidence the pulse will produce two distinct types of electron-hole pairs, depending on the relative signs of σ and. When sgn(σ) = sgn(σ), the pulse will create electron-hole pairs with band+spin and envelope angular momenta both equal to 1. In contrast, for sgn(σ) ≠ sgn(σ), the electron-hole pairs will have neither band+spin nor envelope angular momenta. A tightly focused optical-vortex beam thus makes possible the creation of pairs that cannot be produced with plane waves at normal incidence. With the addition of co-propagating plane waves or switching techniques to change the charge σ both the band+spin and the envelope angular momenta of the pair wave function can be precisely controlled. We discuss possible applications in the field of spintronics that open up. © 2014 American Physical Society.

Registro:

Documento: Artículo
Título:Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams
Autor:Quinteiro, G.F.; Kuhn, T.
Filiación:Departamento de Física and IFIBA, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón I, Ciudad de Buenos Aires, 1428, Argentina
Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Straße 10, Münster, 48149, Germany
Año:2014
Volumen:90
Número:11
DOI: http://dx.doi.org/10.1103/PhysRevB.90.115401
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:10980121
CODEN:PRBMD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v90_n11_p_Quinteiro

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Citas:

---------- APA ----------
Quinteiro, G.F. & Kuhn, T. (2014) . Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams. Physical Review B - Condensed Matter and Materials Physics, 90(11).
http://dx.doi.org/10.1103/PhysRevB.90.115401
---------- CHICAGO ----------
Quinteiro, G.F., Kuhn, T. "Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams" . Physical Review B - Condensed Matter and Materials Physics 90, no. 11 (2014).
http://dx.doi.org/10.1103/PhysRevB.90.115401
---------- MLA ----------
Quinteiro, G.F., Kuhn, T. "Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams" . Physical Review B - Condensed Matter and Materials Physics, vol. 90, no. 11, 2014.
http://dx.doi.org/10.1103/PhysRevB.90.115401
---------- VANCOUVER ----------
Quinteiro, G.F., Kuhn, T. Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams. Phys. Rev. B Condens. Matter Mater. Phys. 2014;90(11).
http://dx.doi.org/10.1103/PhysRevB.90.115401