Laser-driven ultrafast electron emission offers the possibility of manipulation and control of coherent electron motion in ultrashort spatiotemporal scales. Here, an analytical solution is constructed for the highly nonlinear electron emission from a dc biased metal surface illuminated by a single frequency laser, by solving the time-dependent Schrödinger equation exactly. The solution is valid...

An electron wave packet tunneling through a barrier has transmission (or ``group delay'') time ${\ensuremath{\tau}}_{g}$ that, for rectangular barrier, is commonly held to become independent of the width $L$ as increases (the McColl-Hartman effect). In present study, it shown that first, effect dependent upon Gamow factor $\ensuremath{\theta}(k)$ vanishes, and only when large; second, triangula...

Abstract Electric fields play a crucial role in modulating the electronic properties of nanoscale materials. Electron emission, induced by an electric field, is representative phenomenon. Experimental and theoretical aspects such electron emission from graphene are briefly reviewed. The occurs at edge flakes, not surface, because highly concentrates field. Emission currents sensitive to shapes ...

It is shown that sp phase organization plays an important role in the field emission from nanostructured carbons. Emission is found to depend on the cluster size, anisotropy, and mesoscale bonding of the sp phase, and the electronic disorder. It is found by Raman spectroscopy that increasing the size of sp clusters in the 1–10 nm range improves emission. Anisotropy in the sp phase orientation c...

Thickness dependency of the field emission of amorphous and nanostructured carbon thin films has been studied. It is found that in amorphous and carbon films with nanometer-sized sp2 clusters, the emission does not depend on the film thickness. This further proves that the emission happens from the surface sp2 sites due to large enhancement of electric field on these sites. However, in the case...