Journal Article Review van der Waals epitaxy 2D cobalt nanosheets 2D copper chalcogenides 2D layered materials 2D magnetism 2D materials 2D memory devices ambipolar transistors artificial vacancies black phosphorus bridged heterostructures carrier distribution charge transfer dihalides reductions dipolar interaction ferroelectrics ferromagnetism heteroepitaxy in-memory computing intrinsic ferromagnetic behavior labyrinthine domain magnets memristors multiferroics negative differential resistance neuromorphic computing task nonvolatile memory optoelectronic devices