Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 8: Quantum Dots and Wires 2: Optics 1
HL 8.2: Talk
Monday, September 5, 2022, 15:30–15:45, H32
Carrier dynamics in quantum-dot tunnel- injection structures: microscopic theory and experiment — •Michael Lorke1, Igor Khanonkin2, Stephan Michael1, Johann Peter Reithmaier3, Gadi Eisenstein2, and Frank Jahnke1 — 1Institute for Theoretical Physics, University of Bremen, Otto-Hahn-Allee 1, Bremen, 28359, Germany — 2Electrical Engineering Department and Russel Berrie Nanotechnology Institute, Technion, Haifa, 32000, Israel — 3Technische Physik, Institute of Nanostructure Technologies and Analytics, Center of Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Kassel, 34132, Germany
Among the challenges for the next generation of semiconductor lasers is the enhancement of their modulation speed to satisfy the need for higher data transfer rates. For this purpose, tunnel injection lasers are an appealing concept, as they promise improved modulation rates and better temperature stability. Moreover, they eliminate a major detrimental effect of quantum dot lasers, which is the gain nonlinearity caused by hot carriers. It is shown in this work how the aforementioned improvements depend on the design of tunnel-injection devices. We perform a theory-experiment comparison on scattering times in tunnel injection devices to highlight the importance of alignment between the injector well and the quantum dot ensemble. It is shown how differences in the coupling to the injector quantum well caused by the alignment lead to scattering times into the quantum dot ensemble that vary by an order of magnitude.