Light at optical frequencies interacting with a metal surface can excite interband quantum
transitions, or intraband currents at frequencies approaching the PHz range. Momentum …

Excitons, electron–hole pairs bound by the Coulomb potential, are the fundamental
quasiparticles of coherent light–matter interaction relevant for processes such as …

We combine tunable midinfrared (mid-IR) pump pulses with time-and angle-resolved two-
photon photoemission to study ultrafast photoexcitation of the topological surface state (TSS) …

Photons can excite collective and single-particle excitations in metals; the collective
plasmonic excitations are of keen interest in physics, chemistry, optics, and nanotechnology …

Time-and angle-resolved two-photon photoemission (2PPE) was used to study the
electronic structure and ultrafast electron dynamics of the p-doped topological insulator Sb 2 …

Charge excitations across an electronic band gap play an important role in opto-electronics
and light harvesting. In contrast to conventional semiconductors, studies of above-band-gap …

Optical fields interacting with solids excite single particle quantum transitions and elicit
collective screening responses that define their penetration, absorption, and reflection. The …

In this essay we discuss the light-matter interactions at molecule-covered metal surfaces that
initiate surface photochemistry. The hot-electron mechanism for surface photochemistry …

Light interacting with high-electron-density materials elicits an ultrafast coherent many-body
screening response on sub-to few-femtosecond timescales, which makes its experimental …

Light is a preeminent spectroscopic tool for investigating the electronic structure of surfaces.
Time-resolved photoelectron spectroscopy has mainly been developed in the last 30 years …