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Microscopic Modeling of Pump–Probe Spectroscopy and Population Inversion in Transition Metal Dichalcogenides
Author(s) -
Perea-Causín Raül,
Brem Samuel,
Malic Ermin
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000223
Subject(s) - population inversion , renormalization , excited state , population , monolayer , optical pumping , spectroscopy , condensed matter physics , semiconductor , chemistry , transition metal , materials science , molecular physics , atomic physics , optoelectronics , physics , optics , nanotechnology , laser , quantum mechanics , demography , sociology , biochemistry , catalysis
Optical properties of transition metal dichalcogenide (TMD) monolayers are dominated by excitonic effects. These are significantly altered at high carrier densities, leading to energy renormalization, absorption bleaching, and even optical gain. Such effects are experimentally accessible in ultra‐fast pump–probe measurements. Herein, the semiconductor Bloch equations are combined with the generalized Wannier equation to investigate the effect that excited carriers have on the excitonic properties of TMD monolayers. In particular, the dynamics of carrier occupation, energy renormalization, and absorption bleaching as well as population inversion and optical gain are investigated.