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Interference Control of Fano Resonances and Dynamical Imaging of an Electron Wave Packet

Journal Article · · Ultrafast Science
 [1];  [2];  [3];  [3];  [3];  [2];  [3]
  1. ETH Zürich (Switzerland); Kansas State University, Manhattan, KS (United States)
  2. Max Planck Institute for Physics of Complex Systems, Dresden (Germany)
  3. ETH Zürich (Switzerland)
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.
Research Organization:
Kansas State University, Manhattan, KS (United States)
Sponsoring Organization:
Marie Skłodowska-Curie; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
FG02-86ER13491
OSTI ID:
3003081
Journal Information:
Ultrafast Science, Journal Name: Ultrafast Science Vol. 5; ISSN 2765-8791
Publisher:
American Association for the Advancement of Science (AAAS)Copyright Statement
Country of Publication:
United States
Language:
English

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