Elementary formula for the Hall conductivity of interacting systems [PDF]
Titus Neupert, Luiz Santos, Claudio Chamon, Christopher MudryA formula for the Hall conductivity of interacting electrons is given under the assumption that the ground state manifold is N_gs-fold degenerate and discrete translation symmetry is neither explicitly nor spontaneously broken.View original: http://arxiv.org/abs/1207.3747
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