High-order harmonic generation from an atom in a disordered environment

• URL: http://arxiv.org/abs/2605.21223v1
• Date: Wed, 20 May 2026 14:16:24 GMT
• Title: High-order harmonic generation from an atom in a disordered environment
• Abstract summary: We study the photoelectron's strongfield dynamics from an atom surrounded by a scattering environmentally structured.<n>We show that local dephasing of the photoelectron wavepacket induced by elastic scattering leads to global decoherence.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Using one-dimensional simulations analyzed through the lens of open quantum systems, we study the photoelectron's strong-field dynamics from an atom surrounded by a scattering environment stochastically structured. We theoretically investigate high-order harmonic generation from this situation. We show that local dephasing of the photoelectron wavepacket induced by elastic scattering leads to global decoherence. This drives a transition from quantum to classical behavior, as witnessed by the photoelectron probability density localizing around specific trajectories of the classical analog system: unstable periodic orbits. This phenomenon mirrors quantum scars traditionally observed in the eigenfunctions of time-independent systems, such as quantum billiards. Here, it emerges in-situ within a time-dependent framework, manifesting directly in the real-time dynamics from the ground state rather than solely through spectral analysis.

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