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In this work, we analyze properties of cold field emission from a low-dimensional, paraboloidal emitter tip. We find that the entirety of the emitted current density (ECD) originates from a few high-energy, zero-angular-momentum subbands and from a region on the tip that is highly localized around the apex. In addition, Fowler-Nordheim (FN) plots for such emitters are non-linear and do not serve as...
Field emission from “nano diodes” encounter strong deviations from the tunneling barrier presupposed in Fowler Nordheim theory. Modifications to the emission barrier are modeled using a hyperbolic geometry to find trajectories along which Gamow factor is found; a quadratic equivalent potential is determined, and a shape factor method is used to evaluate the total current from a protrusion or wedge...
We have continued our investigation of the tunneling currents between CNTs dispersed randomly in the 3-dimensional potential of a dielectric medium. In addition to the configurations of CNTs which give a 2 orders of magnitude higher current than the standard tip to tip configuration studied previously we have discovered CNT configurations which do the opposite i.e. give currents which are 2 orders...
This paper discusses issues relating to the current-voltage characteristics of large-area field electron emitters (LAFEs). It forms part of a continuing project to investigate how the statistical distribution of individual-emitter characteristics affects the interpretation of Fowler-Nordheim plots taken from the LAFE as a whole. It is assumed that tunneling takes place through a Schottky-Nordheim...
As part of a longer-term project to compare different methods of extracting emission-area data from ideal Fowler-Nordheim plots, this Poster investigates refinements to the extraction-parameter approach. It is shown that varying the choice of the scaled fitting parameter ft, depending on the range of values used for the independent variable, does make a noticeable difference. However, the (usually...
The classical equations for describing the electron current density due to field and thermal emission from planar surfaces are unsuitable for modern nanometer-scale emitters. The planar equations are often presented in the form of Murphy and Good who, in their seminal paper [1], provided a method for deriving both the Fowler-Nordheim (FN) and Richardson-Schottky (RS) equations for field and thermal...
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