Temperature dependence of the excitonic spectra of monolayer transition metal dichalcogenides

doi:10.1007/s11467-018-0786-y

Front. Phys.

2018, Vol. 13

Issue (4) : 137305 https://doi.org/10.1007/s11467-018-0786-y

RESEARCH ARTICLE

Temperature dependence of the excitonic spectra of monolayer transition metal dichalcogenides

Zi-Wu Wang(

), Run-Ze Li, Xi-Ying Dong, Yao Xiao, Zhi-Qing Li

Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Department of Physics, Tianjin University, Tianjin 300354, China

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Abstract

We theoretically study the temperature dependence of the excitonic spectra of monolayer transition metal dichalcogenides using the O′Donnell equation, $E g (T) = E g (0) − S 〈 ℏ w 〉 [coth ? 〈 ℏ w 〉 2 k B T − 1]$ . We develop a theoretical model for the quantitative estimation of the Huang–Rhys factor S and average phonon energy $〈 ℏ w 〉$ based on exciton coupling with longitudinal optical and acoustic phonons in the Fröhlich and deformation potential mechanisms, respectively. We present reasonable explanations for the fitted values of the Huang–Rhys factor and average phonon energy adopted in experiments. Comparison with experimental results reveals that the temperature dependence of the peak position in the excitonic spectra can be well reproduced by modulating the polarization parameter and deformation potential constant.

Keywords transition metal dichalcogenides exciton Huang–Rhys factor

Corresponding Author(s): Zi-Wu Wang

Issue Date: 26 April 2018

Cite this article:

Zi-Wu Wang,Run-Ze Li,Xi-Ying Dong, et al. Temperature dependence of the excitonic spectra of monolayer transition metal dichalcogenides[J]. Front. Phys. , 2018, 13(4): 137305.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-018-0786-y
https://academic.hep.com.cn/fop/EN/Y2018/V13/I4/137305

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