Self-consistent dielectric constant determination or monolayer WSe2

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Title
Self-consistent dielectric constant determination or monolayer WSe2
Author(s)
Seong-Yeon Lee; Tae-Young Jeong; Ji-Hee Kim; Seokjoon Yun; Ki-Ju Yee
Publication Date
2018-09
Journal
OPTICS EXPRESS, v.26, no.18, pp.23061 - 23068
Publisher
OPTICAL SOC AMER
Abstract
Frequency-dependent dielectric constant dispersion of monolayer WSe2, epsilon(omega) = epsilon(1)(omega) + i epsilon(2)(omega) , was obtained from simultaneously measured transmittance and reflectance spectra. Optical transitions of the trion as well as A-, B-, and C-excitons am clearly resolved in the epsilon(2) spectrum. A consistent Kramers-Kronig transformation between the epsilon(1) and epsilon(2) spectra support the validity of the applied analysis. It is found that the A- and B-exciton splitting in the case of the double-layer WSe2 can be attributed to the spin-orbit coupling, which is larger than that in the monolayer WSe2. In addition, the temperature-induced evolution of the A-exciton energy and its width are explained by model equations with electron-phonon interactions. © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
URI
https://pr.ibs.re.kr/handle/8788114/5191
ISSN
1094-4087
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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