Excitonic two-photon absorption in monolayer transition metal dichalcogenides: Impact of screening and trigonal warping

被引：3
作者：
Pedersen, Thomas Garm
Taghizadeh, Alireza
机构：
[1] Department of Materials and Production, Aalborg University, Aalborg Øst
来源：
PHYSICAL REVIEW B | 2021年 / 104卷 / 08期
基金：
新加坡国家研究基金会;
关键词：
BAND-GAP; SEMICONDUCTOR; FLUORESCENCE; SHIFT; MOS2; WS2;
D O I：
10.1103/PhysRevB.104.085431
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Two-photon spectroscopy is an important tool for detection of states that are dark in single-photon spectra. We calculate two-photon absorption spectra for monolayer transition-metal dichalcogenides including excitonic effects based on a Bethe-Salpeter equation approach. Both spin-orbit coupling and trigonal warping are included. Our results reveal that otherwise dark p states dominate the two-photon response. However, weakly allowed two-photon transitions coinciding with single-photon s-state resonances appear due to trigonal warping. The angular momentum character of participating excitons is analyzed and we study the sensitivity to screening by dielectric surroundings and discuss the free-carrier limit. Biexciton contributions to the high-energy two-photon response are estimated using a simplifiedWannier approach. Finally, a brief comparison with recent experiments is given.
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页数：9
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