Nanolocalized nonlinear electron photoemission under coherent control

We theoretically show that two-photon coherent control yields electron photoemission from metal nanostructures that is localized in nanosize hot spots whose positions are controllable on a nanometer scale, in agreement with recent experiments. We propose to use silver V-shapes as tailored nanoantennas for which the position of the coherently controllable photoelectron emission hot spot can be deterministically predicted. We predict that the low-frequency, high-intensity (quasi-stationary) excitation of the photoemission leads to an exponentially high contrast of the coherent control. In various fields of nanoscience and nanotechnology, one of the key processes to achieve is controlled photoinduced injection of charges into nanoscopic regions of semiconductor or metal systems or vacuum. It is very important to perform this injection as an ultrafast process, on a femtosecond or subfemtosecond scale, and have a possibility to choose the injection nanosite dynamically with a nanometer-scale resolution. Such processes can be used, for instance, in sitespecific, time-resolved electron-excitation spectroscopy o