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Physics of Few-Layer Graphene: From Neutrino-like Oscillations to Hofstadter Butterflies

Speaker: 
Mei-Yin Chou (Georgia Tech, USA & Academia Sinica, TW)
Date: 
Thu, 26/06/2014 - 3:00pm to 4:00pm
Location: 
Graphene Seminar Room (S16 level 6)
Host: 
Quek Su Ying
Event Type: 
Seminars

Abstract

The Dirac-Weyl Hamiltonian for massless fermions describes the low-energy quasiparticles in graphene. Going beyond the monolayer, intriguing physics has been found in few-layer graphene 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.

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