Exploration of exciton behavior in atomically thin WS2 layers by ionic gating
KAUST DepartmentMaterial Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant NumberREP/1/2719-01
Online Publication Date2018-07-03
Print Publication Date2018-07-02
Permanent link to this recordhttp://hdl.handle.net/10754/628382
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AbstractThe photoluminescence spectra of mono- and bilayer WS, gated by the ionic liquid, were systematically studied at 77 K. Interesting phenomena, such as a redshift of the exciton peaks and a change in the spectral weight of the exciton, trion, and biexciton peaks, were observed at intermediate doping levels. By increasing the doping level, all the exciton, trion, and biexciton peaks vanished, which is attributed to the phase-space filling effect and the Coulomb screening effect. The variation in the band structure, which was induced by the quantum-confined Stark effect in both the mono- and bilayer WS, was also studied using first-principle calculations.
CitationHe X, Zhang Z, Zhang C, Yang Y, Hu M, et al. (2018) Exploration of exciton behavior in atomically thin WS2 layers by ionic gating. Applied Physics Letters 113: 013104. Available: http://dx.doi.org/10.1063/1.5022327.
SponsorsThis research used the resources of Shaheen II at the King Abdullah University of Science and Technology (KAUST) and was supported by the sensor project (REP/1/2719-01) of the King Abdullah University of Science and Technology (KAUST).
JournalApplied Physics Letters