从复杂光谱分析看强相干场驱动的分子超快共振光子发射

Physics Pub Date : 2024-04-11 DOI:10.3390/physics6020038
Maito Katayama, Satoshi Tanaka, K. Kanki
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引用次数: 0

摘要

在这项研究中,我们研究了由单色相干外场驱动的分子振动振子的时频分辨共振光子发射。利用将不可逆耗散现象整合到量子理论中的 Liouvillian 复杂光谱分析,我们阐明了光子发射的基本过程。事实上,我们的分析方法成功地将发射光谱分解为两个内在贡献:一个来自共振特征模式,另一个来自连续特征模式。这些成分分别负责非相干发光和相干散射光子发射过程。我们的研究结果表明,虽然自发辐射在发射过程的早期阶段占主导地位,但随着时间的推移,相干散射逐渐变得更加明显。此外,这两种成分之间的破坏性量子干涉在决定发射光谱的整体形状方面起着关键作用。
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Ultrafast Resonant Photon Emission from a Molecule Driven by a Strong Coherent Field in Terms of Complex Spectral Analysis
In this study, we investigate the time–frequency-resolved resonant photon emission from a molecular vibrational oscillator driven by a monochromatic coherent external field. Using the complex spectral analysis of the Liouvillian, which integrates irreversible dissipative phenomena into quantum theory, we elucidate the fundamental processes of photon emission. Indeed, our analytical approach successfully decomposes the emission spectrum into two intrinsic contributions: one from a resonance eigenmode and another from continuous eigenmodes. These components are responsible for incoherent luminescence and coherent scattering photon emission processes, respectively. Our results show that while spontaneous emission dominates in the early stages of the emission process, coherent scattering gradually becomes more pronounced with time. Furthermore, destructive quantum interference between the two components plays a key role in determining the overall shape of the emission spectrum.
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