Figure S1. Raman 2D peak deconvolution of a few layers graphene capped quantum dots sample.

Figure S2. Raman spectra of uncapped, graphene and GaAs cap layers quantum dot samples. The dashed lines indicate the wavenumber of GaAs TO and LO modes.

Figure S3. The LO GaAs-like modes measured in the graphene and GaAs capped quantum dot samples.

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