Excitons — electron–hole pairs held together by the Coulomb force — are quasiparticles that are created when light interacts with matter. In metals, exciton generation is hard to detect; indeed, holes are usually not associated with metals. Now, using femtosecond laser pulses triggering three-photon photoemission processes, excitonic response is reported for silver surfaces.
- Xuefeng Cui
- Cong Wang
- Hrvoje Petek
