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Physica E Low-dimensional Systems and Nanostructures

Photocurrent and spin manipulation in quantum dots

J. M. Villas-Bôas, Sergio E. Ulloa, Alexander O. Govorov

Published May 9, 2006• 2 citations
Publisher
DOI
10.1016/j.physe.2006.03.135

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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.
Abstract We report Rabi‐oscillations of the ground state exciton in a single self‐assembled quantum dot (QD). Experimentally, we apply a photocurrent (PC) technique, that enables us to monitor the occupation probability of the exciton state by measuring the dc tunneling current out of the QD. Coherent PC spectrocopy was performed by resonant ps‐excitation of the ground state exciton. Rabi‐oscillations are shown to be directly reflected in the PC. In the case of π‐pulse excitation, we receive a quantitative PC given by I = f × e, with the repetition frequency of the experiment f and the elementary charge e. In our experiment we nearly reach this maximum current showing that our experiment acts as a quantitative proof for Rabi‐flopping in a single QD. In a systematic study of field‐dependence we find Rabi‐oscillations with reduced PC amplitude.