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arXiv:2205.07771 · Physical review. B./Physical review. B

Multiple Rabi rotations of trions in InGaAs quantum dots observed by photon echo spectroscopy with spatially shaped laser pulses

Stefan Grisard, Hendrik Rose, Artur V. Trifonov, Rilana Reichhardt, Doris E. Reiter, Matthias Reichelt, Christian Schneider, Martin Kamp, Sven Höfling, M. Bayer, T. Meier, Ilya A. Akimov

Published Nov 10, 2022• 6 citations

Abstract

The authors investigate Rabi rotations, arising in photon echoes from an ensemble of InGaAs quantum dots. To overcome the dephasing of the Rabi rotations imposed by the inhomogeneity of laser intensities, a spatially flat intensity profile is introduced. This allows to observe robust Rabi rotations and to identify efficient coupling to acoustic phonons as the dominating channel of decoherence. The insights gained are crucial for the realization of optical quantum memories based on photon echoes from semiconductor quantum dots.

DOI: 10.1103/physrevb.106.205408

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The exact optical response of quantum few-level systems depends crucially on the exact choice of the incoming pulse areas. We use four-wave mixing (FWM) spectroscopy to infer the coherent response and dynamics of single InAs quantum dots (QDs) and study their pulse area dependence. By combining atomic force microscopy with FWM hyperspectral imaging, we show that the retrieved FWM signals originate from individual QDs enclosed in natural photonic defects. The optimized light-matter coupling in these defects allows us to perform our studies in a wide range of driving field amplitudes. When varying the pulse areas of the exciting laser pulses, Rabi rotations of microscopic interband coherences can be resolved by the two-pulse FWM technique. We investigate these Rabi coherence rotations within two- and three-level systems, both theoretically and experimentally, and explain their damping by the coupling to acoustic phonons. To highlight the importance of the pulse area influence, we show that the phonon-induced dephasing of QD excitons depends on the pulse intensity.