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Resonant Raman and photoluminescence spectra of suspended molybdenum disulfide

Raman and photoluminescence (PL) measurements were performed on suspended and supported MoS2 up to 6 trilayers (TLs). The difference in the dielectric environment of suspended and supported MoS2 does not lead to large differences in the PL or Raman spectra. Most of the apparent difference in the PL intensity can be explained by the interference effect except for 1TL MoS2. The positions of the Raman peaks are not much different between suspended and supported MoS2. The relative intensities, on the other hand, show some differences between suspended and supported samples. In particular, the inter-layer vibration modes are enhanced near resonance with C excitons, with the breathing modes becoming relatively stronger. Up to 4 breathing modes are resolved in suspended 6TL MoS2.

preprint2015arXivOpen access
Jae-Ung LeeKangwon KimHyeonsik Cheong
cond-mat.mes-hall
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Jae-Ung LeeKangwon KimHyeonsik Cheong

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