Journal
PHYSICAL REVIEW B
Volume 100, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.125308
Keywords
-
Funding
- National Natural Science Foundation of China [11674241]
Ask authors/readers for more resources
In the frame of Huang-Rhys's model, we study multiple orders of Raman scattering in monolayer transition metal chalcogenides (TMDC) based on the intrinsic excitons coupled with three types of phonon modes, including longitudinal optical (LO) phonon, surface optical (SO) phonon, and longitudinal acoustic (LA) phonon. We find that multiphonon structures display multiple order overtones at equal interval energies of (h) over bar omega(LO) and (h) over bar omega(SO), respectively, and intensities of overtones depend on the obtained values of Huang-Rhys factor, which can be modulated by the strength of exciton-optical phonons coupling, cutoff wave vector of optical phonon modes, and large exciton Bohr radius. Moreover, we propose the combined multiphonon processes of p (h) over bar omega(LO )+ m (h) over bar omega(SO) and p (h) over bar omega(LO)(m (h) over bar omega(SO)) + (h) over bar omega(LA). These combined processes with weaker intensity could be used to analyze the fine structure of multiphonon Raman spectra in experiments. Our theoretical results indicate that the strong exciton effect in monolayer TMDC provides an excellent platform for exploring multiphonon Raman scattering.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available