Journal
PHYSICAL REVIEW LETTERS
Volume 96, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.96.086805
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- Engineering and Physical Sciences Research Council [EP/C511743/1] Funding Source: researchfish
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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 2 pi. Its high-magnetic-field Landau-level spectrum consists of almost equidistant groups of fourfold 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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