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Landau level degeneracy and quantum Hall effect in a graphite bilayer.

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<mark>Journal publication date</mark>3/03/2006
<mark>Journal</mark>Physical review letters
Issue number8
Pages (from-to)086805
Publication StatusPublished
<mark>Original language</mark>English


We derive an effective two-dimensional Hamiltonian to describe the low energy electronic excitations of a graphite bilayer, which correspond to chiral quasiparticles with a parabolic dispersion exhibiting Berry phase 2pi. Its high-magnetic-field Landau level spectrum consists of almost equidistant groups of four-fold degenerate states at finite energy and eight zero-energy states. This can be translated into the Hall conductivity dependence on carrier density, sigma_xy(N), which exhibits plateaus at integer values of 4e^2/h and has a “double” 8e^2/h step between the hole and electron gases across zero density, in contrast to (4n + 2)e^2/h sequencing in a monolayer.

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©2006 The American Physical Society