نتایج جستجو برای: potential well
تعداد نتایج: 2398724 فیلتر نتایج به سال:
In this letter, we present a comparative study of positive bias temperature instability (PBTI) reliability in InxGa1−xAs FinFET with varying Indium (x = 0.53, 0.70) percentage and quantization [bulk, quantum well (QW)]. Due to lower effective transport mass and higher injection velocity, In0.7Ga0.3As QW FinFET provides better performance than In0.53Ga0.47As bulk FinFET. However, stronger quanti...
The curvature effect on the electronic states of a deformed cylindrical conducting surface of variable diameter is theoretically investigated. The quantum confinement of electrons normal to the curved surface results in an effective potential energy that affects the electronic structures of the system at low energies. This suggests the possibility that ballistic transport of electrons in low-di...
Kramers’ exit problem is concerned with noise activated escape from a potential well. In case the noise strength, , (temperature measured in units of potential barrier height) is small this becomes a singular perturbation problem. It is shown that actually, most of the probability of the exit points on the separatrix is located at a distance O( √ ) from the saddle point and the probability vani...
We investigate the shifts of the core-level binding energies in small gold nanoclusters by using ab initio density-functional-theory calculations. The shift of the 4f states is calculated for magic-number nanoclusters in a wide range of sizes and morphologies. We find a nonmonotonous behavior of the core-level shift in nanoclusters depending on the size. We demonstrate that there are three main...
The escape of Brownian motion through a narrow absorbing window in an otherwise reflecting boundary of a domain is a rare event. In the presence of a deep potential well, there are two long time scales, the mean escape time from the well and the mean time to reach the absorbing window. We derive a generalized Kramers formula for the mean escape time through the narrow window.
In the article the different aspects of interplay of fields with field carriers are reviewed. ON STABILITY OF GRAVIDYNAMIC SYSTEMS It is necessary to distinguish dynamic stability ("elementary" particles, atoms, space systems) and static stability (nuclei of atoms, solids). Let's consider a gravidynamic system, introduced on a figure 1. Indispensable by attributes of such system is: а). Proper ...
We consider the evolution of Green's function of the one-dimensional Schrödinger equation in the presence of the complex potential −ikδ(x). Our result is the construction of an explicit time-dependent solution which we use to calculate the time-dependent survival probability of a quantum particle. The survival probability decays to zero in finite time, which means that the complex delta potenti...
We describe our studies of two methods for generating bias potentials for use in hyperdynamics simulations. In the first method, first reported by Steiner, et al, the bias potential is the additional energy needed to keep the total potential energy above a fixed level. This potential exerts a negligible computational load and is very easy to code. The second technique involves computing the ite...
On the basis of the perturbation expansion for electron gas energy in the third order to the electron-ion potential the pair and irreducible three-ion interaction potentials in metallic hydrogen are calculated. The irreducible potential of three-ion interaction has attractive nature at short interionic separation and oscillates at large ones. The anisotropic character of the three-ion interacti...
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