Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 17: Two-dimensional Materials I (joint session HL/CPP)
HL 17.9: Vortrag
Dienstag, 2. April 2019, 11:45–12:00, H36
Studying exciton-phonon interaction in a MoSe 2 monolayer by fluorescence-detected 2D electronic micro-spectroscopy — •Donghai Li1, Chiara Trovatello2, Stefano Dal Conte2, Matthias Nuss1, Giancarlo Soavi3, Andrea Ferrari3, Giulio Cerullo2,4, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy — 3Cambridge Graphene Centre, University of Cambridge, Cambridge, UK. — 4Istituto di Fotonica e Nanotecnologie, CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
Monolayer transition metal dichalcogenides (TMDs) received extensive attention as they have extraordinary opto-electronic characteristic. Exciton-phonon interaction in TMD monolayers can result in sidebands in their absorption spectra, for some dark states are activated by exciton-phonon scattering [1]. However, in the absorption spectra, the phonon-induced sidebands are obscured by inhomogeneous broadening. Here, we study the excitonic physics of a MoSe 2 monolayer using fluorescence-based two-dimensional (2D) electronic spectroscopy. We confirm and extend the theoretical prediction [1] by our observations of sidebands and their quantum beating behavior within the 2D spectra. The analysis indicates a four-level energy structure with one dark state near the excited state and an additional, unpredicted, one near the ground state activated by exciton-phonon scattering.
[1] D. Christiansen et al., Phys. Rev. Lett. 119 , 187402 (2017)