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Issue 7, 2015
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Anomalous excitonic resonance Raman effects in few-layered MoS2

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Abstract

The resonance effects on the Raman spectra from 5 to 900 cm−1 of few-layered MoS2 thin films up to 14-layers were investigated by using six excitation energies. For the main first-order Raman peaks, the intensity maximum occurs at ∼2.8 eV for single layered and at ∼2.5 eV for few-layered MoS2, which correspond to the band-gap energy. At the excitation energy of 1.96 eV, several anomalous behaviors are observed. Many second-order peaks are anomalously enhanced even though the main first-order peaks are not enhanced. In the low-frequency region (<100 cm−1), a broad peak centered at ∼38 cm−1 and its second order peak at 76 cm−1 appear for the excitation energy of 1.96 eV. These anomalous resonance effects are interpreted as occuring due to the strong resonance with excitons or exciton–polaritons.

Graphical abstract: Anomalous excitonic resonance Raman effects in few-layered MoS2

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Publication details

The article was received on 02 Oct 2014, accepted on 06 Jan 2015 and first published on 08 Jan 2015


Article type: Paper
DOI: 10.1039/C4NR05785F
Citation: Nanoscale, 2015,7, 3229-3236
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    Anomalous excitonic resonance Raman effects in few-layered MoS2

    J. Lee, J. Park, Y. Son and H. Cheong, Nanoscale, 2015, 7, 3229
    DOI: 10.1039/C4NR05785F

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