Exploring coherence of individual excitons in InAs quantum dots embedded in natural photonic defects: Influence of the excitation intensity
| Autor: | Tomasz Jakubczyk, Q. Mermillod, S. Le-Denmat, F. Fras, C. Schneider, Gilles Nogues, Tilmann Kuhn, Jacek Kasprzak, Martin Kamp, Doris E. Reiter, Sven Höfling, Daniel Wigger |
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| Přispěvatelé: | University of St Andrews. School of Physics and Astronomy, University of St Andrews. Condensed Matter Physics |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed Matter - Mesoscale and Nanoscale Physics business.industry European research Exciton NDAS FOS: Physical sciences Physics::Optics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences 010309 optics QC Physics Quantum dot Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Optoelectronics Photonics 010306 general physics business QC Excitation Coherence (physics) |
| Zdroj: | Physical Review B. 96 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We acknowledge the financial support by the European Research Council (ERC) Starting Grant PICSEN (grant no. 306387) 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 in uence, we show that the phonon-induced dephasing of QD excitons depends on the pulse intensity. Postprint |
| Databáze: | OpenAIRE |
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