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Theory of coherent pump–probe spectroscopy in monolayer transition metal dichalcogenides
Theory of coherent pump–probe spectroscopy in monolayer transition metal dichalcogenides
- Source :
- 2D Materials. 7:015021
- Publication Year :
- 2019
- Publisher :
- IOP Publishing, 2019.
-
Abstract
- A valley-selective circular dichroism and a pronounced spin-valley locking in monolayer transition metal dichalcogenides (TMDCs) enable the investigation of new many-body physics revealed in the ultrafast nonlinear optical response of these atomically thin materials. While this topic is experimentally well studied in pump-probe spectroscopy, only a fragmented theoretical understanding is available due to the complexity and multitude of occurring effects. Here, a microscopic approach is presented to describe the ultrafast pump-probe response of monolayer TMDCs in the coherent limit. We focus on close to band edge excitations dominated by strongly correlated, bound electron-hole pairs, namely excitonic excitations. The approach includes Hartree–Fock and correlation effects up to two excitonic excitations known from conventional semiconductors as well as TMDC typical Coulomb mechanisms such as intra- and intervalley excitation and charge transfer. The investigated coherent limit is able to explain different signatures observed in ultrafast pump-probe spectroscopy for temporal pump-probe overlap within one consistent formalism dominated by excitons, biexcitons, and exciton-exciton scattering states.
- Subjects :
- Physics
Condensed Matter::Other
Scattering
business.industry
Mechanical Engineering
Exciton
02 engineering and technology
General Chemistry
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Molecular physics
Semiconductor
Mechanics of Materials
0103 physical sciences
Monolayer
Coulomb
General Materials Science
010306 general physics
0210 nano-technology
business
Spectroscopy
Biexciton
Excitation
Subjects
Details
- ISSN :
- 20531583
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- 2D Materials
- Accession number :
- edsair.doi...........8807a617719b34fea99075c385248213
- Full Text :
- https://doi.org/10.1088/2053-1583/ab5407