Efficient Excitonic Photoluminescence in Direct and Indirect Band Gap Monolayer MoS2

Nano Letters
A SteinhoffC Gies

Abstract

We discuss the photoluminescence (PL) of semiconducting transition metal dichalcogenides on the basis of experiments and a microscopic theory. The latter connects ab initio calculations of the single-particle states and Coulomb matrix elements with a many-body description of optical emission spectra. For monolayer MoS2, we study the PL efficiency at the excitonic A and B transitions in terms of carrier populations in the band structure and provide a quantitative comparison to an (In)GaAs quantum well-structure. Suppression and enhancement of PL under biaxial strain is quantified in terms of changes in the local extrema of the conduction and valence bands. The large exciton binding energy in MoS2 enables two distinctly different excitation methods: above-band gap excitation and quasi-resonant excitation of excitonic resonances below the single-particle band gap. The latter case creates a nonequilibrium distribution of carriers predominantly in the K-valleys, which leads to strong emission from the A-exciton transition and a visible B-peak even if the band gap is indirect. For above-band gap excitation, we predict a strongly reduced emission intensity at comparable carrier densities and the absence of B-exciton emission. The resu...Continue Reading

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Citations

Dec 18, 2015·Nano Letters·Kenneth R O'NealJanice L Musfeldt
Aug 24, 2016·ACS Applied Materials & Interfaces·Seungae LeeJyongsik Jang
Nov 8, 2016·Nature Communications·Malte SeligAndreas Knorr
Nov 11, 2016·Nature Communications·Yu-Ming HeChristian Schneider
Dec 28, 2016·Nano Letters·Simone LatiniKristian S Thygesen
Jan 12, 2017·Scientific Reports·Tien-Tien YehChih-Wei Luo
Nov 15, 2016·Scientific Reports·Dilna AzhikodanSangeeta Sharma
Jul 26, 2017·Nano Letters·Bastian MillerUrsula Wurstbauer
Apr 17, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Matthew N BrunettiRoman Ya Kezerashvili
Jun 5, 2018·Physical Chemistry Chemical Physics : PCCP·J ZhangQ Jiang
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Apr 16, 2019·Nanoscale·Dominik AndrzejewskiGerd Bacher
Sep 26, 2019·Scientific Reports·Christian GebhardtDavid Hunger
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Dec 5, 2020·Science·Meng Xing Na, Ziliang Ye
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Jul 12, 2019··Subbiah AlwrappanMukesh Mishra

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