Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Ultra-Fast Phenomena
HL 13.6: Talk
Tuesday, September 6, 2022, 11:00–11:15, H33
Coherent Dynamics of Charge-Transfer Excitons — •Markus Stein1, Melanie Fey1, Christian Fuchs2, Wolfgang Stolz2, Kerstin Volz2, and Sangam Chatterjee1 — 1Institute of Experimental Physics I and Center for Materials Research, Justus-Liebig-University Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany — 2Department of Physics and Material Sciences Center, Philipps-Universität Marburg, Renthof 5, 35032 Marburg, Germany
Charge carrier transport phenomena through internal interfaces in semiconductor heterostructures are currently in the spotlight of scientific research due to the advancing miniaturization of devices. However, how internal interfaces in semiconductor heterostructures affect the coherent dynamics, i.e., the transition from a coherent polarization to a population, is largely unexplored. To shed some light on the subject, we use a GaInAs/GaAs/GaAsSb type-II like double quantum well structure which, due to its design, exhibits a charge-transfer exciton resonance in the linear absorption. This allows us to study the coherent dynamics of charge-transfer excitons and excitons that can relax across the internal interface into a charge-transfer state by means of degenerate four-wave-mixing. Furthermore, adding an optical prepulse, the phase relaxation of charge-transfer excitons subjected to collisions with either free carriers or incoherent excitons is investigated.