Topological contribution to magnetism in the Kane-Mele model: An explicit wave function approach
arXiv:2204.09932 · doi:10.1103/PhysRevB.107.085201
Abstract
In our previous publication [S. Ozaki and M. Ogata, Phys. Rev. Research 3, 013058], the quantization of the orbital-Zeeman (OZ) cross term in the magnetic susceptibility, or the cross term of spin Zeeman and orbital effect, was shown for the Kane-Mele model using the expansion around the Dirac points. In the present study, we accurately evaluate the orbital, spin-Zeeman, and OZ cross term of the Kane-Mele model using a recently developed formulation. This formula is written in terms of the explicit Bloch wave functions, and enables us to evaluate each contribution taking account of the integration over the whole Brillouin zone and the summation over all the bands. As a result, additional contributions such as core-electron diamagnetism are found. Furthermore, our evaluation confirms the quantization of the OZ cross term and reveals its behavior including the metallic case. The possibility of experimental detection of the quantization is discussed.
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