Microscopic Modeling of Pump-Probe Spectroscopy and Population Inversion in Transition Metal Dichalcogenides
Journal article, 2020

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.

transition metal dichalcogenides

strong excitation

excitons

carrier dynamics

Author

Raul Perea Causin

Chalmers, Physics, Condensed Matter and Materials Theory

Samuel Brem

Chalmers, Physics, Condensed Matter and Materials Theory

Ermin Malic

Chalmers, Physics, Condensed Matter and Materials Theory

Physica Status Solidi (B): Basic Research

0370-1972 (ISSN) 1521-3951 (eISSN)

Vol. 257 12 2000223

Exciton dynamics in atomically thin materials

Swedish Research Council (VR), 2019-01-01 -- 2024-12-31.

Graphene Core Project 3 (Graphene Flagship)

European Commission (EC), 2020-04-01 -- 2023-03-31.

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics

DOI

10.1002/pssb.202000223

More information

Latest update

1/5/2021 9