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

Nguepnang J. V.; Kenfack-Sadem C.; Kenfack-Jiotsa A.Fobasso M. F. C.Sun Y.

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

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

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Abstract 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 MoS2 monolayer and the lowest with the WSe2 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 WSe2, MoSe2, WS2 and MoS2.

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《Optical and Quantum Electronics》 |2021年第12期|共5页
作者
Nguepnang J. V.; Kenfack-Sadem C.; Kenfack-Jiotsa A.Fobasso M. F. C.Sun Y.;
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作者单位

Université de Yaoundé 1;

University of Dschang;

Inner Mongolia University for Nationalities;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类光学;
关键词
Bipolaron; Bandgap; Magnetic field; TMDs; Electron-phonon interaction;

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

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