Plasmon effects in photoemission

Abstract

Recently, we observe an increasing interest in the laser-assisted processes that take place at the solids surfaces or at the interfaces of semiconductor heterostructures. These processes are affected by the plasmon effects induced by the interaction of quasi-free electrons in solids with laser fields. The plasmon effects lead to a significant enhancement of the oscillating in time electric field in a vicinity of the surface. The latter strongly modifies processes such as the high-order harmonic generation from atoms passing close to the surface, the electron photoemission from metal tips or the tunneling processes in semiconductor heterostructures. In our paper, we focus on the photoemission phenomenon accounting for the space-dependence of an oscillating in time, effective electric field created at the surface.