Conductivity activation energy for bilayer hetero-structures at integer filling numbers

Details Conductivity activation energy for bilayer hetero-structures at integer filling numbers Conductivity activation energy for bilayer hetero-structures at integer filling numbers

2000-03-08

arxiv.org/abs/cond-mat/0003120v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

latex, 25 pages, 5 figures

Scientific paper

We report on study of low-energy excitations in a bilayer hetero-structure 2D electron gas. We split the bilayer Hamiltonian into SU(4)-symmetric part and the anisotropy part and treat the latter as a perturbation. We find that both Goldstone and the charged excitations - skyrmions - are goverened by the non-linear Sigma Model. We calculate the anisotropic energy gap of the skyrmion to have a prominent minimum in the canted antiferromagnetic phase of bilayer. We compare our findings with the results of recent experiments.

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