Dr. Claus Hermannstädter Profile

Dr. Claus Hermannstädter

Senior Director Strategy/Business Development at Carl Zeiss Industrielle Messtechnik GmbH

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Proceedings Article | 8 February 2007 Paper

Tunable lateral tunnel coupling between two self-assembled InGaAs quantum dots

Gareth Beirne, Claus Hermannstädter, Lijuan Wang, Armando Rastelli, Elisabeth Müller, Oliver Schmidt, Peter Michler

Proceedings Volume 6471, 647104 (2007) https://doi.org/10.1117/12.697165

KEYWORDS: Quantum dots, Molecules, Excitons, Gallium arsenide, Picosecond phenomena, Quantum computing, Semiconductors, Chemical species, Molecular beam epitaxy, Quantum communications

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We demonstrate direct control over the level of lateral quantum coupling between two self-assembled InGaAs/GaAs quantum dots. This coupled system, which we also refer to as a lateral quantum dot molecule, was produced using a unique technique which combines molecular beam epitaxy and in-situ atomic layer etching. Atomic force microscopy measurements show that each molecule consists of two structurally distinct dots, which are aligned along the [1-10] direction. Each molecule exhibits a characteristic photoluminescence spectrum primarily consisting of two neutral excitonic and two biexcitonic transitions. The various transitions have been investigated using micro-photoluminescence measurements as a function of excitation power density, time, and applied electric field. Photon statistics experiments between the excitonic emission lines display strong antibunching in the second-order cross-correlation function which confirms that the two dots are quantum coupled. Cascaded emission between corresponding biexcitonic and excitonic emission has also been observed. Using a parallel electric field we can control the quantum coupling between the dots. This control manifests itself as an ability to reversibly switch the relative intensities of the two neutral excitonic transitions. Furthermore, detailed studies of the emission energies of the two neutral excitonic transitions as a function of parallel lateral electric field show a clear anomalous Stark shift which further demonstrates the presence of quantum coupling between the dots. In addition, this shift allows for a reasonable estimate of the coupling energy. Finally, a simple one-dimensional model, which assumes that the coupling is due to electron tunneling, is used to qualitatively describe the observed effects.

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