Abstract
Formulas for the contribution of the conduction electrons to the polarization and magnetization are derived for disordered systems and within a one-particle framework. These results generalize known formulas for Bloch electrons and the presented proofs considerably simplify and strengthen prior justifications. The new formulas show that orbital polarization and magnetization are of geometric nature. This leads to quantization for a periodically driven Piezo effect as well as the derivative of the magnetization w.r.t. the chemical potential. It is also shown how the latter is connected to boundary currents in Chern insulators. The main technical tools in the proofs are an adaption of Nenciu’s super-adiabatic theory to C*-dynamical systems and Bellissard’s Ito derivatives w.r.t. the magnetic field.
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Schulz-Baldes, H., Teufel, S. Orbital Polarization and Magnetization for Independent Particles in Disordered Media. Commun. Math. Phys. 319, 649–681 (2013). https://doi.org/10.1007/s00220-012-1639-0
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DOI: https://doi.org/10.1007/s00220-012-1639-0