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A unified perspective of high-harmonic generation in gases and solids

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arxiv 2508.14212 v1 pith:LDQGOQPO submitted 2025-08-19 physics.atom-ph

A unified perspective of high-harmonic generation in gases and solids

classification physics.atom-ph
keywords gasessolidschannelsgenerationharmonichigh-harmonicintrabandcontains
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We present a quantum optical generalization of the quantum-matter Lewenstein model of high-harmonic generation (HHG) in gases that contains two channels corresponding to the inter- and intraband HHG in solids. Both channels can be presented as a semiclassical current multiplied by the vacuum field strength, resulting in a quantitative correction and a faster roll-off of the harmonic power with order than in previous theories. In gases, like in solids, intraband HHG dominates at low orders; the switchover harmonic corresponds to a specific photon energy, independent of pump wavelength.

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