Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 51: Semiconductor lasers I
HL 51.10: Talk
Wednesday, March 18, 2020, 17:45–18:00, POT 51
Lasing of an artificial, topological defect in a 1D, linear Su-Schrieffer-Heeger chain — •Philipp Gagel1, Tristan Harder1, Monika Emmerling1, Sebastian Klembt1, Christian Schneider1, and Sven Höfling1,2 — 1Technische Physik and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Julius-Maximilians-Universität Würzburg, Würzburg, Germany — 2SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK
The concept of topology has been adapted to categorize states of matter by topological invariants: Quantities which persist under adiabatic deformation. One of the various distinct features is the appearance of edge- and corner states between areas with different topological invariants, that are immune to external perturbations. Here we demonstrate lasing from an artificially created topological defect in a one-dimensional, linear Su-Schrieffer-Heeger chain of coupled photonic cavities by non-resonant optical pumping. The stability against distortions in combination with the intrinsic energy gap of the system provides a source for stable single mode lasing that is well suited for the next generation of optoelectronic devices, which can potentially be operated under electrical pumping and at ambient conditions.