Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams

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 or...

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Autores principales: Quinteiro, G.F., Kuhn, T.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10980121_v90_n11_p_Quinteiro
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_10980121_v90_n11_p_Quinteiro2023-10-03T16:06:27Z Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams Quinteiro, G.F. Kuhn, T. 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. Fil:Quinteiro, G.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10980121_v90_n11_p_Quinteiro
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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.
format JOUR
author Quinteiro, G.F.
Kuhn, T.
spellingShingle Quinteiro, G.F.
Kuhn, T.
Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams
author_facet Quinteiro, G.F.
Kuhn, T.
author_sort Quinteiro, G.F.
title Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams
title_short Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams
title_full Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams
title_fullStr Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams
title_full_unstemmed Light-hole transitions in quantum dots: Realizing full control by highly focused optical-vortex beams
title_sort light-hole transitions in quantum dots: realizing full control by highly focused optical-vortex beams
url http://hdl.handle.net/20.500.12110/paper_10980121_v90_n11_p_Quinteiro
work_keys_str_mv AT quinteirogf lightholetransitionsinquantumdotsrealizingfullcontrolbyhighlyfocusedopticalvortexbeams
AT kuhnt lightholetransitionsinquantumdotsrealizingfullcontrolbyhighlyfocusedopticalvortexbeams
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