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Two‐dimensional heterostructures are generally extremely sensitive to perturbations due to the large surface–volume ratio. A widely used non‐destructive experimental technique to characterize these perturbations is the Raman spectroscopy. However, vibrational frequencies of monolayer MoS2 is proven to be non‐sensitive to perturbations such as strain and doping. In order to characterize the effect...
The most relevant two‐phonon band in the Raman spectrum of graphene is the 2D band. In addition, there are numerous other combination bands with much smaller intensities in the observed spectra (e.g. or ). Their origin can be understood within the double resonance theory. However, calculations on single‐layer graphene found in the literature so far took into account only the Stokes processes...
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