  Here, we present a micro-electromechanical system (MEMS) for the
investigation of the electromechanical coupling in graphene and potentially
related 2D materials. Key innovations of our technique include: (1) the
integration of graphene into silicon-MEMS technology; (2) full control over
induced strain fields and doping levels within the graphene membrane and their
characterization via spatially resolved confocal Raman spectroscopy; and (3)
the ability to detect the mechanical coupling of the graphene sheet to the MEMS
device with via their mechanical resonator eigenfrequencies.
