Interplay between many body effects and Coulomb screening in the optical bandgap of atomically thin MoS2
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- Interplay between many body effects and Coulomb screening in the optical bandgap of atomically thin MoS2
- Park, Youngsin; Han, Sang Wook; Chan, Christopher C. S.; Reid, Benjamin P. L.; Taylor, Robert A.; Kim, Nammee; Jo, Yongcheol; Im, Hyunsik; Kim, Kwang S.
- Issue Date
- ROYAL SOC CHEMISTRY
- NANOSCALE, v.9, no.30, pp.10647 - 10652
- Due to its unique layer-number dependent electronic band structure and strong excitonic features, atomically thin MoS2 is an ideal 2D system where intriguing photoexcited-carrier-induced phenomena can be detected in excitonic luminescence. We perform micro-photoluminescence (PL) measurements and observe that the PL peak redshifts nonlinearly in mono-and bi-layer MoS2 as the excitation power is increased. The excited carrier-induced optical bandgap shrinkage is found to be proportional to n(4/3), where n is the optically-induced free carrier density. The large exponent value of 4/3 is explicitly distinguished from a typical value of 1/3 in various semiconductor quantum well systems. The peculiar n(4/3) dependent optical bandgap redshift may be due to the interplay between bandgap renormalization and reduced exciton binding energy.
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