Interaction of excitons with Cherenkov radiation in WSe 2 beyond the non-recoil approximation

Autor:	Fatemeh Chahshouri, Masoud Taleb, Florian K Diekmann, Kai Rossnagel, Nahid Talebi
Jazyk:	angličtina
Předmět:	Acoustics and Ultrasonics 0103 physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 010306 general physics 0210 nano-technology Condensed Matter Physics 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials
Zdroj:	Journal of Physics D: Applied Physics
ISSN:	1361-6463 0022-3727
DOI:	10.1088/1361-6463/ac453a
Popis:	Cherenkov radiation (CR) from electrons propagating in materials with a high refractive index have applications in particle-detection mechanisms and could be used for high-yield coherent electron beam-driven photon sources. However, the theory of the CR has been treated up to now using the non-recoil approximation, which neglects the effect of electron deceleration in materials. Here, we report on the effect of electron-beam deceleration on the radiated spectrum and exciton-photon interactions in nm-thick WSe2 crystals. The calculation of the CR is performed by simulating the kinetic energy of an electron propagating in a thick sample using the Monto Carlo method combined with the Lienard–Wiechert retarded potential. Using this approach, we numerically investigate the interaction between the excitons and generated photons (CR) beyond the non-recoil approximation and are able to reproduce experimental cathodoluminescence spectra. Our findings pave the way for an accurate design of particle scintillators and detectors, based on the strong-coupling phenomenon.
Databáze:	OpenAIRE
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