Laser-assisted Fano resonance: attosecond quantum control and dynamical imaging

• URL: http://arxiv.org/abs/2302.04090v1
• Date: Wed, 8 Feb 2023 14:41:18 GMT
• Title: Laser-assisted Fano resonance: attosecond quantum control and dynamical imaging
• Authors: Meng Han, Hao Liang, Jia-bao Ji, Leung Chung Sum, Kiyoshi Ueda, Jan Michael Rost, Hans Jakob W\"orner
• Abstract summary: A Fano resonance arises from the pathway interference between discrete and continuum states. We introduce the concept of a laser-assisted Fano resonance, created from two interferometric pathways that are coupled together by an additional laser field.
• Score: 5.028785861056659
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: A Fano resonance arises from the pathway interference between discrete and continuum states, playing a fundamental role in many branches of physics, chemistry and material science. Here, we introduce the concept of a laser-assisted Fano resonance, created from two interferometric pathways that are coupled together by an additional laser field, which introduces a controllable phase delay between them and results in a generalized Fano lineshape that can be actively controlled on the {\it attosecond} time scale. Based on our experimental results of unprecedented resolution, we dynamically image a resonant electron wave packet during its evolution directly in the time domain, extracting both the amplitude and the phase, which allows for the measurement of the {\it resonant} photoionization time delay. Ab-initio calculations and simulations employing a physically transparent two-level model agree with our experimental results, laying the groundwork for extending our concepts into attosecond quantum control of complex systems.

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