Journal
NATURE PHYSICS
Volume 11, Issue 10, Pages 815-U184Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3436
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Funding
- Minerva Foundation
- Israeli Science Foundation
- Crown Center of Photonics
- European Research Council
- DFG [SM 292/2-3, SM 292/3-1]
- Einstein foundation [A-211-55]
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Attosecond physics offers new insights into ultrafast quantum phenomena involving electron dynamics on the fastest measurable timescales. The rapid progress in this field enables us to re-visit one of the most fundamental strong-field phenomena: field-induced tunnel ionization(1-3). In this work, we employ high-harmonic generation to probe the electron wavefunction during field-induced tunnelling through a potential barrier. By using a combination of strong and weak driving laser fields, we modulate the atomic potential barrier on optical subcycle timescales. This induces a temporal interferometer between attosecond bursts originating from consecutive laser half-cycles. Our study provides direct insight into the basic properties of field-induced tunnelling, following the evolution of the electronic wavefunction within a temporal window of approximately 200 attoseconds.
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