Pseudo-zero-mode Landau levels and pseudospin waves in bilayer graphene

Details Pseudo-zero-mode Landau levels and pseudospin waves in bilayer graphene Pseudo-zero-mode Landau levels and pseudospin waves in bilayer graphene

2009-12-11

arxiv.org/abs/0912.2198v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, ep2ds18, Physica E

Scientific paper

Bilayer graphene in a magnetic field supports eight zero-energy Landau levels, which, as a tunable band gap develops, evolve into two nearly-degenerate quartets separated by the band gap. A close look is made into the properties of such an isolated quartet of pseudo-zero-mode levels at half filling in the presence of an in-plane electric field and the Coulomb interaction. The pseudo-zero-mode levels turn out to support, via orbital mixing, charge carriers with induced electric dipole moment, which lead to characteristic collective excitations, pseudospin waves, with some controllable features; possible experimental signals are discussed.

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