Electrons photoemitted by strong laser fields can rescatter, generating attosecond high harmonics. Spectral peaks arise from inter- and intracycle interference of coherent electron wave packets. While intercycle interference is well known, intracycle interference of plateau electrons has not been observed. We present carrier-envelope phase-resolved photoemission spectra from a nanometric tungsten needle tip driven at 1570 nm revealing such interference, supported by quantum orbit and TDSE simulations that elucidate attosecond-scale electron dynamics.

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• Electron emission
• Light-matter interaction
• Multiphoton or tunneling ionization & excitation
• Elemental materials
• Metals
• Nanostructures
• First-principles calculations
• Photoemission
• Quantum orbits theory
• Schroedinger equation
• Strong-field approximation