Spectral broadening of optical transitions at tunneling resonances in InAs/GaAs coupled quantum dot pairs
| العنوان: | Spectral broadening of optical transitions at tunneling resonances in InAs/GaAs coupled quantum dot pairs |
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| المؤلفون: | A. S. Bracker, Samuel G. Carter, Michael Scheibner, Daniel Gammon, Cameron Jennings, Parveen Kumar |
| المصدر: | Physical Review B. 102 |
| بيانات النشر: | American Physical Society (APS), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed matter physics, Exciton, FOS: Physical sciences, Biasing, 02 engineering and technology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Transition rate matrix, 01 natural sciences, Coupling (physics), Laser linewidth, Quantum dot, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, 010306 general physics, 0210 nano-technology, Quantum tunnelling, Doppler broadening |
| الوصف: | We report on linewidth analysis of optical transitions in InAs/GaAs coupled quantum dots as a function of bias voltage, temperature, and tunnel coupling strength. A significant line broadening up to 100 $\mu$eV is observed at hole tunneling resonances where the coherent tunnel coupling between spatially direct and indirect exciton states is maximized, corresponding to a phonon-assisted transition rate of 150 ns${}^{-1}$ at 20 K. With increasing temperature, the linewidth shows broadening characteristic of single-phonon transitions. The linewidth as a function of tunnel coupling strength tracks the theoretical prediction of linewidth broadening due to phonon-assisted transitions, and is maximized with an energy splitting between the two exciton branches of 0.8$-$0.9 meV. This report highlights the linewidth broadening mechanisms and fundamental aspects of the interaction between these systems and the local environment. Comment: 11 pages, 7 figures |
| تدمد: | 2469-9969 2469-9950 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99c993faa392cc1d37b75661bd7d1b4a https://doi.org/10.1103/physrevb.102.085423 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....99c993faa392cc1d37b75661bd7d1b4a |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24699969 24699950 |
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