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Symmetry 2018, 10(8), 313; https://doi.org/10.3390/sym10080313

Ultrafast Dynamics of High-Harmonic Generation in Terms of Complex Floquet Spectral Analysis

Department of Physical Science, Osaka Prefecture University, Gakuen-cho 1-1, Sakai 599-8531, Japan
These authors contributed equally to this work.
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Received: 3 July 2018 / Revised: 28 July 2018 / Accepted: 30 July 2018 / Published: 1 August 2018
(This article belongs to the Special Issue New Trends in Quantum Electrodynamics)
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Abstract

We studied the high-harmonic generation (HHG) of a two-level-system (TLS) driven by an intense monochromatic phase-locked laser based on complex spectral analysis with the Floquet method. In contrast with phenomenological approaches, this analysis deals with the whole process as a coherent quantum process based on microscopic dynamics. We have obtained the time-frequency resolved spectrum of spontaneous HHG single-photon emission from an excited TLS driven by a laser field. Characteristic spectral features of the HHG, such as the plateau and cutoff, are reproduced by the present model. Because the emitted high-harmonic photon is represented as a superposition of different frequencies, the Fano profile appears in the long-time spectrum as a result of the quantum interference of the emitted photon. We reveal that the condition of the quantum interference depends on the initial phase of the driving laser field. We have also clarified that the change in spectral features from the short-time regime to the long-time regime is attributed to the interference between the interference from the Floquet resonance states and the dressed radiation field. View Full-Text
Keywords: high-harmonic generation; fano effect; quantum interference; Floquet method; complex spectral analysis high-harmonic generation; fano effect; quantum interference; Floquet method; complex spectral analysis
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Yamane, H.; Tanaka, S. Ultrafast Dynamics of High-Harmonic Generation in Terms of Complex Floquet Spectral Analysis. Symmetry 2018, 10, 313.

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