Probing the Properties of MPc/Multilayer-graphene/hBN heterostructures through quantum coherent transport

Multilayer-graphene/hBN heterostructures are often used to probe the electronic properties of other materials. For instance, magnetotransport measurements at low magnetic fields on multilayer graphene usually show a signature of weak localization, a consequence of the quantum interference of the electronic wave functions. The presence of metal-phthalocyanine (MPc) molecules in close proximity to the multilayer-graphene/hBNheterostructure can alter the quantum coherent transport, inducing for example weak antilocalization if the metal in the MPc molecule has an important spin-orbit coupling. In the same way, the back gate dependence of the resistance of the heterostructure before and after the deposition of the molecules, can reveal charge transfer between the molecules and the multilayer graphene. Here, we show data on a CuPc/multilayer-graphene/hBN heterostructure that puts in evidence charge transfer from graphene to the CuPc as well as consequences on weak localization measurements.