Quantum Interference Visibility Spectroscopy in Two-Color Photoemission from Tungsten Needle Tips
Li A, Pan Y, Dienstbier P, Hommelhoff P (2021)
Publication Language: English
Publication Type: Journal article, Letter
Publication year: 2021
Journal
Book Volume: 126
Article Number: 137403
DOI: 10.1103/PhysRevLett.126.137403
Abstract
When two-color femtosecond laser pulses interact with matter, electrons can be emitted through various multiphoton excitation pathways. Quantum interference between these pathways gives rise to a strong oscillation of the photoemitted electron current, experimentally characterized by its visibility. In this Letter, we demonstrate the two-color visibility spectroscopy of multiphoton photoemissions from a solid-state nanoemitter. We investigate the quantum pathway interference visibility over an almost octave-spanning wavelength range of the fundamental (ω) femtosecond laser pulses and their second harmonic (2ω). The photoemissions show a high visibility of 90% ± 5%, with a remarkably constant distribution. Furthermore, by varying the relative intensity ratio of the two colors, we find that we can vary the visibility between 0% and close to 100%. A simple but highly insightful theoretical model allows us to explain all observations, with excellent quantitative agreements. We expect this work to be universal to all kinds of photo-driven quantum interference, including quantum control in physics, chemistry, and quantum engineering.
Authors with CRIS profile
Ang Li
Lehrstuhl für Laserphysik
Philip Dienstbier
Lehrstuhl für Laserphysik
Peter Hommelhoff
Lehrstuhl für Laserphysik
Involved external institutions
Israel (IL)How to cite
APA:
Li, A., Pan, Y., Dienstbier, P., & Hommelhoff, P. (2021). Quantum Interference Visibility Spectroscopy in Two-Color Photoemission from Tungsten Needle Tips. Physical Review Letters, 126. https://doi.org/10.1103/PhysRevLett.126.137403
MLA:
Li, Ang, et al. "Quantum Interference Visibility Spectroscopy in Two-Color Photoemission from Tungsten Needle Tips." Physical Review Letters 126 (2021).
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