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Tunable fractional quantum Hall effect in bilayer graphene

Using a novel technique to fabricate bilayer graphene devices with ultra-high mobility we observe the fractional quantum Hall effect and demonstrate that the associated ground state is tunable by application of a transverse displacement field.  Our result was featured on the cover of science!

1D edge contact to 2D materials

By metalizing the 1D edge of an encapsulated graphene sheet we demonstrate a new device architecture for layered materials.  Our results appeared in Science!

Hofstadter's Butterfly

When graphene is placed in contact with hexagonal boron, a moire pattern develops with long range order, which in turn looks like a crystal field to the free electrons in the graphene layer.  We were able to exploit the large length-scale of the moire superlattice  (~15 nm) to observe the long predicted Hofstadter butterfly fractal energy spectrum - a result physicists have been chasing for more than 30 years!  Our resuls appeared in the magazine Nature .

-UPDATE- Physics world has identified our results as one of the "top ten breakthroughs of 2013".