Chien-Chang (Kyle) Chen
We grow graphene on copper surface at low temperature. And then we observe it using a Scanning Tunneling Microscope (STM). When graphene lies on the surface of any kind of lattice, the mismatch between sites will cause different patterns to show under the microscope. If you cut the copper in the (1,1,1) direction, the copper shows a triangular lattice surface. If you cut the copper in the (1,0,0) direction, you see the square lattice. Here we use the computer to simulate the pattern and its Fourier transformation at several angles.