dorsal/arxiv
View SchemaHigh-harmonic generation and periodic level crossings: time profile and control
| Authors | C. Figueira de Morisson Faria, I Rotter |
|---|---|
| Categories | |
| ArXiv ID | physics/0112076 |
| URL | https://arxiv.org/abs/physics/0112076 |
Abstract
We investigate high-harmonic generation in closed systems, using the two-level atom as a simplified model. By means of a windowed Fourier transform of the time-dependent dipole acceleration, we extract the main contributions to this process within a cycle of the driving field. We show that the patterns obtained can be understood by establishing a parallel between the two-level atom and the three-step model. In both models, high-harmonic generation is a consequence of a three-step process, which involves either the continuum and the ground state, or the adiabatic states of the two-level Hamiltonian. The knowledge of this physical mechanism allows us to manipulate the adiabatic states, and consequently the harmonic spectra, by means of a bichromatic driving field. Furthermore, using scaling laws, we establish sharp criteria for the invariance of the physical quantities involved. Consequently, our results can be extended to a broader parameter range, as for instance those characteristic of solid-state systems in strong fields.
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"date_created": "2026-03-02T18:00:39.550000Z",
"date_modified": "2026-03-02T18:00:39.550000Z",
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"abstract": "We investigate high-harmonic generation in closed systems, using the\ntwo-level atom as a simplified model. By means of a windowed Fourier transform\nof the time-dependent dipole acceleration, we extract the main contributions to\nthis process within a cycle of the driving field. We show that the patterns\nobtained can be understood by establishing a parallel between the two-level\natom and the three-step model. In both models, high-harmonic generation is a\nconsequence of a three-step process, which involves either the continuum and\nthe ground state, or the adiabatic states of the two-level Hamiltonian. The\nknowledge of this physical mechanism allows us to manipulate the adiabatic\nstates, and consequently the harmonic spectra, by means of a bichromatic\ndriving field. Furthermore, using scaling laws, we establish sharp criteria for\nthe invariance of the physical quantities involved. Consequently, our results\ncan be extended to a broader parameter range, as for instance those\ncharacteristic of solid-state systems in strong fields.",
"arxiv_id": "physics/0112076",
"authors": [
"C. Figueira de Morisson Faria",
"I Rotter"
],
"categories": [
"physics.atom-ph"
],
"title": "High-harmonic generation and periodic level crossings: time profile and control",
"url": "https://arxiv.org/abs/physics/0112076"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "9271c09e-bf09-49b0-97a4-eb77d2dc43ad",
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