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DOE OSTI · 23183186

Low-frequency and Moiré–Floquet engineering: A review

Rodriguez-Vega, Martin·Vogl, Michael·Fiete, Gregory A.
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Abstract

Highlights: • Review of theoretical and experimental advances in Floquet engineering. • Review of theories to derive effective Floquet Hamiltonians, with a focus on the low-frequency regime. • Review of the theoretical effects of light in Moiré materials. We review recent work on low-frequency Floquet engineering and its application to quantum materials driven by light, focusing on van der Waals systems hosting Moiré superlattices. These non-equilibrium systems combine the twist-angle sensitivity of the band structure with the flexibility of light drives. The frequency, amplitude, and polarization of light can be tuned in experimental setups, leading to platforms with on-demand properties. First, we review recent theoretical developments to derive effective Floquet Hamiltonians, emphasizing the low-frequency regime. We then review applications of some of these theories to study twisted graphene and transition metal dichalcogenide systems irradiated by light in free space and inside a waveguide. We study the changes induced in the quasienergies and steady-states, which can lead to topological transitions. Next, we consider van der Waals magnetic materials driven by low-frequency light pulses in resonance with the phonons. We discuss the phonon dynamics induced by the light and the resulting magnetic transitions from a Floquet perspective. We finish by outlining new directions for Moiré–Floquet engineering in the low-frequency regime and their relevance for technological applications.

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71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS77 NANOSCIENCE AND NANOTECHNOLOGYGRAPHENEHAMILTONIANSIRRADIATIONMAGNETIC MATERIALSPHONONSPOLARIZATIONPULSESRESONANCESTEADY-STATE CONDITIONSSUPERLATTICESTOPOLOGYTRANSITION ELEMENTSVAN DER WAALS FORCESWAVEGUIDES

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Rodriguez-Vega, Martin, Vogl, Michael, Fiete, Gregory A.. 2021-12-15. Low-frequency and Moiré–Floquet engineering: A review. https://doi.org/10.1016/j.aop.2021.168434

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