title: Light-Matter Interaction at Surfaces in the Spatiotemporal Limit of Macroscopic Models.
abstract: What is the spatiotemporal limit of a macroscopic model that describes the optoelectronic interaction at the interface between different media? This fundamental question has become relevant for time-dependent photoemission from solid surfaces using probes that resolve attosecond electron dynamics on an atomic length scale. We address this fundamental question by investigating how ultrafast electron screening affects the infrared field distribution for a noble metal such as Cu(111) at the solid-vacuum interface. Attosecond photoemission delay measurements performed at different angles of incidence of the light allow us to study the detailed spatiotemporal dependence of the electromagnetic field distribution. Surprisingly, comparison with Monte Carlo semiclassical calculations reveals that the macroscopic Fresnel equations still properly describe the observed phase of the IR field on the Cu(111) surface on an atomic length and an attosecond time scale.
authors.affiliation: Department of Physics, ETH Zurich, 8093 Zürich, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Lucchini
authors.affiliation: Department of Physics, University of Zurich, 8057 Zürich, Switzerland.
authors.forename: L
authors.initials: L
authors.lastname: Castiglioni
authors.affiliation: Department of Physics, ETH Zurich, 8093 Zürich, Switzerland.
authors.forename: L
authors.initials: L
authors.lastname: Kasmi
authors.affiliation: Department of Physics, University of Zurich, 8057 Zürich, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Kliuiev
authors.affiliation: Department of Physics, ETH Zurich, 8093 Zürich, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Ludwig
authors.affiliation: Department of Physics, University of Zurich, 8057 Zürich, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Greif
authors.affiliation: Department of Physics, University of Zurich, 8057 Zürich, Switzerland.
authors.forename: J
authors.initials: J
authors.lastname: Osterwalder
authors.affiliation: Department of Physics, University of Zurich, 8057 Zürich, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Hengsberger
authors.affiliation: Department of Physics, ETH Zurich, 8093 Zürich, Switzerland.|Institute of Applied Physics, University of Bern, 3012 Bern, Switzerland.
authors.forename: L
authors.initials: L
authors.lastname: Gallmann
authors.affiliation: Department of Physics, ETH Zurich, 8093 Zürich, Switzerland.
authors.forename: U
authors.initials: U
authors.lastname: Keller