@article{oai:tsukuba.repo.nii.ac.jp:00016927,
author = {初貝, 安弘 and Hatsugai, Y. and Ryu, S. and Kohmoto, M.},
issue = {5},
journal = {Physical review B},
month = {Aug},
note = {application/pdf, Motivated by the geometric character of spin Hall conductance, the topological invariants of generic superconductivity are discussed based on the Bogoliuvov-de Gennes equation on lattices. They are given by the Chern numbers of degenerate condensate bands for unitary order, which are realizations of Abelian chiral anomalies for non-Abelian connections. The three types of Chern numbers for the x , y , and z directions are given by covering degrees of some doubled surfaces around the Dirac monopoles. For nonunitary states, several topological invariants are defined by analyzing the so-called q helicity. Topological origins of the nodal structures of superconducting gaps are also discussed.},
title = {Superconductivity and Abelian chiral anomalies},
volume = {70},
year = {2004}
}