Optical signature of bipolaron in monolayer transition metal dichalcogenides: all coupling approach

We studied the optical signature of bipolaron and its effects on the bandgap modulation in the single-layer Transition Metal Dichalcogenides (TMDs) under magnetic field. Using the Huybrecht method, we derived the ground state energies in the modified zero Landau levels for all Fröhlich coupling cons...

Full description

Saved in:
Bibliographic Details
Published in:Optical and quantum electronics 2021-12, Vol.53 (12), Article 728
Main Authors: Nguepnang, J. V., Kenfack-Sadem, C., Kenfack-Jiotsa, A., Fobasso, M. F. C., Sun, Y.
Format: Article
Language:English
Subjects:
Chalcogenides
Characterization and Evaluation of Materials
Computer Communication Networks
Coupling
Electrical Engineering
Energy gap
Lasers
Magnetic fields
Modulation
Molybdenum disulfide
Monolayers
Optical Devices
Optics
Phonons
Photonics
Physics
Physics and Astronomy
Substrates
Transition metal compounds
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We studied the optical signature of bipolaron and its effects on the bandgap modulation in the single-layer Transition Metal Dichalcogenides (TMDs) under magnetic field. Using the Huybrecht method, we derived the ground state energies in the modified zero Landau levels for all Fröhlich coupling constants. We take into account both intrinsic longitudinal optical phonon modes and surface optical phonon modes induced by the polar substrate. We observed that the higher the coupling strength, the stronger is the magnetic field effect. The highest amplitude of the bandgap modulation is obtained for the MoS 2 monolayer and the lowest with the WSe 2 monolayer. We also found that the bipolaron is stable in TMDs. It is seen that the optical absorption presents the threshold values and respectively increases for WSe 2 , MoSe 2 , WS 2 and MoS 2 .
ISSN:0306-8919
1572-817X
DOI:10.1007/s11082-021-03365-1