Interference Control of Fano Resonances and Dynamical Imaging of an Electron Wave Packet
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2025-01
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Journal Article
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Abstract
The Fano line shape, arising from the interference of pathways for the excitation of discrete and continuum states, plays a fundamental role in many branches of physics, chemistry, and materials science. Exciting the resonance with a high harmonic provides naturally a phase delay between the pathways leading to a complex asymmetry parameter. We demonstrate that its amplitude and phase can be controlled on the femtosecond and attosecond time scales, respectively. With our high-energy-resolution (10-meV) experiment, we dynamically image a resonance-enhanced electron wave packet during its temporal evolution, extracting both the amplitude and the phase. Calculations reproduce our experimental results. Our approach constitutes a method for measuring the photoionization delays of a resonance and enables the reconstruction of the electron wave packet in the time domain. This concept of an interference-controlled Fano line shape is a step toward attosecond quantum optics with potential ramifications into nanoscience and next-generation optical materials.
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published
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5
Pages / Article No.
91
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AAAS
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03888 - Wörner, Hans Jakob / Wörner, Hans Jakob
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Funding
801459 - Fellowship Program of the NCCR MUST (National Competence Center for Research in Molecular Ultrafast Science and Technology) and the Cluster of Excellence RESOLV (EC)
172946 - Soft-X-ray spectroscopy on the attosecond time scale (SNF)
172946 - Soft-X-ray spectroscopy on the attosecond time scale (SNF)