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arXiv:cond-mat/0509731 · AIP conference proceedings

Spin polarized photocurrent from a single quantum dot

J. M. Villas-Bôas

Published Jan 1, 2005• 3 citations
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Abstract

In this paper we model the effects of applying strong polarized light on a self‐assembled single quantum dot photodiode. We use a density matrix formalism where electron and hole tunneling is introduced by rates obtained from a microscopic description. Our analysis shows that elliptical polarized light results in spin‐polarized photocurrents, and that sharp polarization reversal can be produced with increasing pulse area. This behavior can be used as a dynamical switch to invert the spin‐polarization of the extracted current.

DOI
10.1063/1.1994290

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In this paper we model the effects of applying strong polarized light on a self‐assembled single quantum dot photodiode. We use a density matrix formalism where electron and hole tunneling is introduced by rates obtained from a microscopic description. Our analysis shows that elliptical polarized light results in spin‐polarized photocurrents, and that sharp polarization reversal can be produced with increasing pulse area. This behavior can be used as a dynamical switch to invert the spin‐polarization of the extracted current.
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We develop and apply a new dynamical model for rigorous description of circularly (elliptically) polarized ultrashort optical pulse interactions with the resonant nonlinearities in semiconductor optical waveguides. The method is based on self‐consistent solution in the time domain of the vector Maxwell equations for electromagnetic wave propagation coupled via macroscopic polarization to the coherent time‐evolution equations of a discrete N‐level system in terms of the real pseudospin (coherence) vector. We investigate theoretically the optically‐induced ultrafast resonant coherent spin dynamics in a singly charged semiconductor quantum dot. Onset of Rabi oscillations at sufficiently high excitation intensities is demonstrated numerically resulting in suppression of the spin relaxation and a longer decay time of the polarized photoluminescence.
We develop and apply a new dynamical model for rigorous description of circularly (elliptically) polarized ultrashort optical pulse interactions with the resonant nonlinearities in semiconductor optical waveguides. The method is based on self‐consistent solution in the time domain of the vector Maxwell equations for electromagnetic wave propagation coupled via macroscopic polarization to the coherent time‐evolution equations of a discrete N‐level system in terms of the real pseudospin (coherence) vector. We investigate theoretically the optically‐induced ultrafast resonant coherent spin dynamics in a singly charged semiconductor quantum dot. Onset of Rabi oscillations at sufficiently high excitation intensities is demonstrated numerically resulting in suppression of the spin relaxation and a longer decay time of the polarized photoluminescence.
We present an original scheme to rotate at will one electron spin trapped in a quantum dot by just acting on pump-laser polarization: The quantum control is based on the virtual excitation of electron light-hole pairs with pi symmetry, as possibly done by using a single laser beam with a propagation axis slightly tilted with respect to a weak magnetic field. This allows us to fully control the effective axis of the electron spin rotation through the pump polarization. Our analysis shows that quantum dots with inverted valence states are ideal candidates for ultrafast, high-fidelity, all optical control.