title: Two-Color Coherent Control of Femtosecond Above-Threshold Photoemission from a Tungsten Nanotip.
abstract: We demonstrate coherent control of multiphoton and above-threshold photoemission from a single solid-state nanoemitter driven by a fundamental and a weak second harmonic laser pulse. Depending on the relative phase of the two pulses, electron emission is modulated with a contrast of the oscillating current signal of up to 94%. Electron spectra reveal that all observed photon orders are affected simultaneously and similarly. We confirm that photoemission takes place within 10 fs. Accompanying simulations indicate that the current modulation with its large contrast results from two interfering quantum pathways leading to electron emission.
authors.affiliation: Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstraße 1, 91058 Erlangen, Germany.|Max Planck Institute of Quantum Optics, Hans-Kopfermann-Straße 1, 85748 Garching, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Förster
authors.affiliation: Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstraße 1, 91058 Erlangen, Germany.
authors.forename: Timo
authors.initials: T
authors.lastname: Paschen
authors.affiliation: Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstraße 1, 91058 Erlangen, Germany.|Max Planck Institute of Quantum Optics, Hans-Kopfermann-Straße 1, 85748 Garching, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Krüger
authors.affiliation: Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Christoph
authors.initials: C
authors.lastname: Lemell
authors.affiliation: Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Georg
authors.initials: G
authors.lastname: Wachter
authors.affiliation: Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Florian
authors.initials: F
authors.lastname: Libisch
authors.affiliation: Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Thomas
authors.initials: T
authors.lastname: Madlener
authors.affiliation: Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria.
authors.forename: Joachim
authors.initials: J
authors.lastname: Burgdörfer
authors.affiliation: Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstraße 1, 91058 Erlangen, Germany.|Max Planck Institute of Quantum Optics, Hans-Kopfermann-Straße 1, 85748 Garching, Germany.|Max Planck Institute for the Science of Light, Staudtstraße 2, 91058 Erlangen, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Hommelhoff