Top left: AFM image of graphene on PZT substrate. Top middle: optical image of graphene field-effect device with and without HfO2 topgate. Top right: SEM image of bilayer graphene device with and without HfO2 topgate. Bottom left: TEM image and electron diffraction from a graphene fluoride(CF) flake. Bottom right: SEM image of as-grown graphene on Cu surface.
The Zhu lab works on an exciting carbon material called graphene. It consists of one atomic layer of carbon atoms
arranged in a homeycomb lattice and has many unusual electronic and optical properties. For example, electrons in
graphene behave like photons moving with a speed that is 1/300 of the speed of light. Unlike any other semiconductors,
graphene has no band gap. The conduction and valence bands are two cones touching at one point. Electrons in graphene
are extremely mobile, even at room temperature. This makes it a promising material for high-speed electronics. It is
also unusual that graphene is both transparent to light and highly conductive at the same time. Can graphene and carbon
electronics eventually replace silicon? We don't know, but there is so much to do and we are having so much fun,
we are not working on anything else at the moment.
The scope of our studies is broad. We are interested in both the fundamental physics of this unusual two-dimensional material and application potentials. We use a variety of tools from chemical synthesis to materials characterization (SEM, TEM, XRD, XPS) and optical (Raman, FTIR, PL) measurements.
Please feel free to browse our current projects and contact us if you have questions and comments.