The interest in surface terahertz emitters lies in their extremely thin active region, typically hundreds of atomic layers, and the agile surface scalability. The ultimate limit in the achievable emission is determined by the saturation of the several different mechanisms concurring to the THz frequency conversion. Although there is a very prolific debate about the contribution of each process,...

Quantum conductivity of single-wall carbon nanotube Y-junctions is calculated. The current versus voltage characteristics of these junctions show asymmetry and rectification, in agreement with recent experimental results. Furthermore, rectification is found to be independent of the angle between the branches of these junctions, indicating this to be an intrinsic property of symmetric Y-junction...

We study the rectification of current through a single molecule with an intrinsic spatial asymmetry. The molecule contains a cobaltocene moiety in order to take advantage of its relatively localized and high-energy d states. A rectifier with large voltage range, high current, and low threshold can be realized. The evolution of molecular orbitals under both forward and reverse biases is captured...

We propose a simple method for computing a metric rectification of a plane from multiple views taken by Ki = diag( fi, fi,1) cameras. The orthogonality properties of this camera model are exploited from an early stage to achieve a straightforward optimization process with only two degrees of freedom, even if the fi in all views are unknown. We study the optimization landscapes for several typic...

proving the validity of the present numerical approach. The results were also compared to the FEM simulations made by White et al. The ion current rectification in the pore of 10 μm length and half-cone angle of 12°, filled with 1 mM KCl solution was simulated. In this case the rectification ratio r(E) 35 is 1.39, while White et al report 1.38. The tiny difference in the obtained result is prob...