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Fano Quantum Interference Effects in Exciton-Biexciton Coherently Coupled System in Quantum Dots

Hideki Gotoh, Haruki Sanada, Hiroshi Yamaguchi, Tetsuomi Sogawa

Published Jan 1, 2013• 0 citations
Publisher

Abstract

Optical nonlinear effects are examined using a two-color micro-photoluminescence method in a coherently-coupled exciton-biexciton system in a single quantum dot. The exciton nonlinear absorption spectrum shows an unusual asymmetric shape induced by Fano interference effects.
DOI
10.1364/cleo_qels.2013.qm3b.3

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We report on large optical nonlinear effects induced by coherent interactions between excitons and biexcitons in quantum dots. The absorption spectra in an exciton–biexciton system are measured in InGaAs quantum dots by using single dot spectroscopy. The spectra exhibit unusual shapes that have a transparent region under a strong excitation condition. A pump–probe measurement ensures that the exciton state is erased by a quantum interference effect with exciton and biexciton photoabsorption processes. These results suggest that optical functions such as electromagnetically induced transparency are feasible with excitons and biexcitons in quantum dots.
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Summary form only given. Two excitons can bind to form a biexciton through the Coulomb interaction. In a quantum dot (QD), the binding is greatly enhanced due to 3D confinement. Previous work has focused on luminescence from biexciton-to-exciton transitions. We report the first coherent nonlinear optical spectra of a biexcitonic system. Such types of studies provide vital information on the exciton/biexciton lifetime as well as the optically-induced quantum coherence and its decay. The realization of coherent optical devices based on QD systems, such as proposed for quantum logic operations, relies critically on these measurements.
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