Exciton Relaxation Cascade in two-dimensional Transition Metal Dichalcogenides

Scientific Reports
Samuel BremErmin Malic

Abstract

Monolayers of transition metal dichalcogenides (TMDs) are characterized by an extraordinarily strong Coulomb interaction giving rise to tightly bound excitons with binding energies of hundreds of meV. Excitons dominate the optical response as well as the ultrafast dynamics in TMDs. As a result, a microscopic understanding of exciton dynamics is the key for a technological application of these materials. In spite of this immense importance, elementary processes guiding the formation and relaxation of excitons after optical excitation of an electron-hole plasma has remained unexplored to a large extent. Here, we provide a fully quantum mechanical description of momentum- and energy-resolved exciton dynamics in monolayer molybdenum diselenide (MoSe2) including optical excitation, formation of excitons, radiative recombination as well as phonon-induced cascade-like relaxation down to the excitonic ground state. Based on the gained insights, we reveal experimentally measurable features in pump-probe spectra providing evidence for the exciton relaxation cascade.

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Citations

Nov 21, 2019·Physical Chemistry Chemical Physics : PCCP·Maja FeierabendErmin Malic
Sep 22, 2020·Physical Review Letters·Hsiao-Yi ChenMarco Bernardi
Sep 7, 2019·Physical Review Letters·H H FangX Marie
Oct 21, 2020·Nature Communications·Chiara TrovatelloStefano Dal Conte
Jan 14, 2021·Nanoscale·Raül Perea-CausínErmin Malic
Jan 24, 2021·Nature Communications·Ioannis ParadisanosBernhard Urbaszek
Jun 5, 2021·The Journal of Physical Chemistry Letters·Dan WangXiaolong Zou
Sep 19, 2019·Nano Letters·Raül Perea-CausínErmin Malic
Nov 13, 2020·The Journal of Physical Chemistry Letters·David FeldsteinErmin Malic
Nov 20, 2021·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Joshua J P ThompsonErmin Malic
Dec 12, 2021·Nature Communications·Roberto RosatiErmin Malic

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