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Absolute timing of the photoelectric effect
M Ossiander1,2, J Riemensberger3,4, S Neppl5
1Physik-Department, Technische Universität München, Garching, Germany. marcus.ossiander@mpq.mpg.de.
Nature
|September 21, 2018
Summary
Introducing the atomic chronoscope method, this study precisely times electron emission processes in condensed matter. It reveals faster-than-expected photoemission from tungsten and instantaneous response from adsorbates, offering new insights into electron dynamics.
Area of Science:
- Condensed matter physics
- Attosecond science
- Surface science
Background:
- Photoemission spectroscopy is crucial for understanding materials.
- Attosecond metrology enables tracking electron dynamics but lacks precise timing.
- Previous studies couldn't determine the exact duration of electron emission processes.
Purpose of the Study:
- To overcome timing ambiguities in attosecond spectroscopy.
- To precisely measure electron emission timings in solids and on surfaces.
- To investigate electron dynamics in condensed matter with unprecedented temporal resolution.
Main Methods:
- Development and application of the atomic chronoscope method for absolute timing.
- Utilizing subfemtosecond light pulses for time-resolved measurements.
- Conducting experiments on tungsten surfaces with and without atomic adsorbates.
Main Results:
- The atomic chronoscope method provides absolute timing of photoemission processes.
- Photoemission from tungsten conduction bands is faster than previously thought.
- Electron emission from core states aligns with semiclassical models, while adsorbates show instantaneous response.
Conclusions:
- Precise electron timing is essential for advanced modeling of attosecond responses in solids.
- The atomic chronoscope provides benchmark data for electron dynamics.
- This method opens new avenues for studying excitation and charge migration in adsorbate systems.
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