1202.2302 (Maxim Trushin et al.)

Polarization-sensitive absorption of THz radiation by interacting
electrons in chirally stacked multilayer graphene    [PDF]

Maxim Trushin, John Schliemann

We show that opacity of a clean multilayer graphene flake depends on the
helicity of the circular polarized electromagnetic radiation. The effect can be
understood in terms of the pseudospin selection rules for the interband optical
transitions in the presence of exchange electron-electron interactions which
alter the pseudospin texture in momentum space. The interactions described
within a semi-analytical Hartree--Fock approach lead to the formation of the
topologically different broken--symmetry states characterized by Chern numbers
and zero-field anomalous Hall conductivities.

View original: http://arxiv.org/abs/1202.2302