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arXiv · 2508.01946

Orbital Inverse Faraday and Cotton-Mouton Effects in Hall Fluids

Gabriel Cardoso·Erlend Syljuåsen·Alexander V. Balatsky
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Abstract

We report two light-induced orbital magnetization effects in quantum Hall (QH) fluids, stemming from their transverse response. The first is a purely transverse contribution to the inverse Faraday effect (IFE), where circularly polarized light induces a DC magnetization by stirring the charged fluid. This contribution dominates the IFE in the QH regime. The second is the orbital inverse Cotton-Mouton effect (ICME), in which linearly polarized light generates a DC magnetization. Since the applied field in the ICME does not break time-reversal symmetry, the induced magnetization directly probes the chiral orbital response of the fluid at the driving frequency. We estimate that the resulting magnetization lies in the range of 0.5-10 Bohr magnetons per charge carrier in materials such as graphene and transition-metal dichalcogenides (TMDs) in the QH regime. Finally, we show that the induced magnetization is accompanied by a local correction to the static particle density, enabling optical quantum printing of density profiles into the QH fluid.

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Gabriel Cardoso, Erlend Syljuåsen, Alexander V. Balatsky. 2025-08-03. Orbital Inverse Faraday and Cotton-Mouton Effects in Hall Fluids. https://doi.org/10.1103/z4db-gt69

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