Coherent multidimensional photoelectron spectroscopy of ultrafast quasiparticle dressing by light.

ABSTRACT: Depending on the applied strength, electromagnetic fields in electronic materials can induce dipole transitions between eigenstates or distort the Coulomb potentials that define them. Between the two regimes, they can also modify the electronic properties in more subtle ways when electron motion becomes governed by time and space-periodic potentials. The optical field introduces new virtual bands through Floquet engineering that under resonant conditions interacts strongly with the preexisting bands. Under such conditions the virtual bands can become real, and real ones become virtual as the optical fields and electronic band dispersions entangle the electronic response. We reveal optical dressing of electronic bands in a metal by exciting four-photon photoemission from the Cu(111) surface

SUBMITTER: Reutzel M 

PROVIDER: S-EPMC7203103 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature