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Events in Physics
Title: Physics Of Graphene And Bilayer Graphene: Neutrino-like Oscillations And Hofstadter Butterflies    (Colloquia)
Start Date: 01/28/2013
Time: 4:15 pm
Location: 1 LeConte Hall
Speaker: Mei-Yin Chou
Affiliation: Professor, and Chair, Georgia Tech
Contact Person: Sarah Wittmer   (510) 642-3034

It has become possible in recent years to fabricate and manipulate two-dimensional nanomaterials in the laboratory that are as thin as one to few atomic layers. A well-known example is graphene, where the Dirac-Weyl Hamiltonian for massless fermions describes the low-energy quasiparticles. Intriguing physics has been found in these few-layer systems, and phenomena originally associated with particle physics can now be observed in condensed matter systems. In this talk, I will focus on our recent theoretical and computational studies of a few representative systems. In particular, the quasiparticle states in rotated bilayer graphene systems act as massless fermions with two “flavors”, and interlayer coupling induces neutrino-like oscillations and anisotropic transport. In addition, a rare fractal-like “butterfly” energy spectrum arises under an external magnetic field. These two-dimensional atomic layer systems provide a unique platform to probe the rich physics involving multiple interacting massless fermions.