Analysis of photo-induced chirality and magnetic toroidal moment based on Floquet formalism

Abstract

We analyze the condition of photo-induced atomic-scale chirality and magnetic toroidal moment. By performing a high-frequency expansion in the Floquet formalism, we derive an effective static model Hamiltonian from the spinful $s$-$p$ hybridized model of a single atom interacting with an electromagnetic wave with a particular polarization. The lowest-order and third-order contributions in the high-frequency expansion give rise to the coupling to induce an electric toroidal monopole corresponding to microscopic chirality, while the second-order contribution provides the coupling to induce a magnetic toroidal dipole. We also discuss the condition of the polarization of the electromagnetic wave and induced multipoles. Our results stimulate a new direction of controlling unconventional multipoles by electromagnetic waves.

arXiv comment9 pages, 3 figures, 2 tables

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• Predominant Electronic Order Parameter for Structural Chirality -- Role of Spinless Electronic Toroidal Multipoles
• Spin-flip Scattering at a Chiral Interface of Helical Chains
• Nonlinear frequency-asymmetric optical response in chiral systems
• Standard model of electromagnetism and chirality in crystals