Orbital magnetization of Floquet topological systems

Topp, G. E.; Törmä, P.; Kennes, D. M.; Mitra, A.

doi:10.1103/PhysRevB.105.195426

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Orbital magnetization of Floquet topological systems

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Kennes, D. M.
Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;

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https://arxiv.org/abs/2201.07769
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https://doi.org/10.1103/PhysRevB.105.195426
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PhysRevB.105.195426.pdf
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Citation

Topp, G. E., Törmä, P., Kennes, D. M., & Mitra, A. (2022). Orbital magnetization of Floquet topological systems. Physical Review B, 105(19): 195426. doi:10.1103/PhysRevB.105.195426.

Cite as: https://hdl.handle.net/21.11116/0000-0009-D925-9

Abstract

A general expression for the orbital magnetization of a Floquet system is derived. The expression holds for a clean system and is valid for any driving protocol and arbitrary occupation of the bands. The orbital magnetization is shown to be large not only for Chern insulators, but also for anomalous phases where the Chern number does not fully account for the topology. In addition, the orbital magnetization is shown to take significant values both for a thermal equilibrium occupation of the Floquet bands and for occupations determined by a quantum quench from an initial state with zero orbital magnetization. For the latter case, the orbital magnetization is shown to be highly sensitive to van Hove singularities of the Floquet bands.