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Lecture notes in nanoscale science and technology

Phonon-Assisted Processes and Spontaneous Emission in Double Quantum Dots

Paweł Karwat, Krzysztof Gawarecki, Katarzyna Roszak, Anna Sitek, Paweł Machnikowski

Published Sep 8, 2013• 2 citations
Publisher
DOI
10.1007/978-1-4614-8130-0_9

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Hole-phonon interactions play an important role in transport and decoherence processes in semiconductor quantum dots. Here we investigate hole-phonon coupling in a gate-defined GaAs double quantum dot integrated with a quantum point contact charge sensor. Under finite source-drain bias, pronounced oscillatory stripe patterns appear near specific charge transition regions in the charge stability diagram. We attribute these oscillations to phonon emission during inelastic interdot tunneling. A theoretical model including piezoelectric hole-phonon coupling reproduces the observed patterns. Furthermore, our analysis shows that the oscillations emerge only in particular charge configurations. Our results provide direct insight into phonon-assisted transport and coherent hole-phonon interactions in semiconductor quantum dots.