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CAMP: Bilayer graphene under pressure: Bands Structure, Anomalous Hall Effect, and Landau Levels

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Jorge Sofo, Pennsylvania State University
When
01 December 2015 from 3:30 PM to 4:30 PM
Where
339 Davey Laboratory
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The electronic structure of bilayer graphene under pressure develops very interesting features with an enhancement of the trigonal warping and a splitting of the parabolic touching bands at K into four Dirac cones, one at K and three along the T symmetry lines. As pressure is increased, these cones separate in reciprocal space and in energy, breaking the electron-hole symmetry. Due to their separation in energy, their opposite Berry curvature can be observed in valley Hall effect experiments and in the structure of the Landau levels. Based on the electronic structure obtain by Density Functional Theory, we developed a low energy Hamiltonian that allows us to predict the effects of pressure on measurable quantities such as the Hall conductivity and the Landau levels of the system. 

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