Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 25: Poster 1
HL 25.8: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P2
Destructive Photon Echo Formation in Six-Wave Mixing Signals Induced by Local Field Effects — •Thilo Hahn1, Jacek Kasprzak2, Tilmann Kuhn1, and Daniel Wigger3 — 1Institute of Solid State Theory, University of Münster, Germany — 2Université Grenoble Alpes, CNRS, France — 3School of Physics, Trinity College Dublin, Ireland
The optical properties of transition metal dichalcogenides have emerged as an outstanding topic in nanoscience. In these materials, tightly bound excitons dominate the optical response. Ultrafast nonlinear spectroscopy is an ideal tool to study the excitonic properties and their dynamics. To model the dynamics of excitonic transitions we use a few-level system with an additional local field (LF) effect to describe exciton-exciton interaction [1]. Effectively, the LF shifts the transition energy depending on the exciton occupation, which is directly visible in pump-probe experiments [2]. In this contribution we consider six-wave mixing spectroscopy [3], where we discover a new destructive photon echo effect, that is produced by the LF contribution. In contrast to the traditional echo formed by constructive interference [4], the signal is temporarily suppressed due to destructive quantum interference.
[1] T. Hahn, et al., New J. Phys. 23, 023036 (2021), [2] A. Rodek et al., Nanophotonics 10, 2717 (2021), [3] T. Hahn, et al., Adv. Sci. 9, 2103813 (2021), [4] E. L. Hahn, Phys. Rev. 80, 580 (1950)