Quantum Mechanical Simulation of Charge Transport in Very Small Semiconductor Structures

A quantum mechanical simulation method of charge transport in very small semiconductor devices, based on the numerical solution of the time-dependent Schrödinger equation (coupled self-consistently to the Poisson equation to determine the electrostatic potential in the device), is presented. Carrier transport is considered within the effective mass approximation, while the effects of the electron-phonon interaction are included in an approximation that is consistent with the results of the perturbation theory and gives the correct two-point time correlation function. Numerical results for the transient behavior of a planar ultrasubmicrometer three-dimensional GaAs MESFET (gate length of 26 nm) are also presented. They indicate that extremely fast gate-step response times (switching times) characterize such short-channel GaAs devices. © 1989 IEE

Existence Results for Quasilinear Degenerated Equations vias Strong Convergence of Truncations

Abstract In this paper, we study the existence of entropy solution for quasilinear elliptic equations of the form, is a non-linear term which has a growth condition with respect to ξ and no growth with respect to s, but it satisfies a sign condition on s. key words: Quasilinear elliptic equation, Sobolev spaces with variable exponent, entropy stronglyregular solution, truncations. References [1] Y

Is Your Electricity Clean?

This activity, from the Real World Learning Objects Resource Library, bridges the gap for students between understanding the effects of energy production on the climate and their own personal experiences by "helping students calculate the amount of electrical energy they use in real life and measure the impact their energy consumption has on the global climate." This site explains the 60-minute activity, complete with learning goals, step-by-step classroom procedures, materials, assessment activities, and resources for further information. The "Content Materials" section contains directions for students and links to further information to help them understand concepts in energy conversion and consumption. This is an excellent ready-to-use and easy-to-adapt resource for educators in the physics and environmental science classroom

L

� � � � � � � � � � � � � � � � � � � � P i(1≤i≤M) � � � � � � � � � � � � � � � � � � � � Q j(1≤j≤N), � � � � rotate[i][j] � � � � P i � � Q j � � � � � � � � � � � � � � , � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �. � � � � P i � � Q j � � � � � � � � � � � � � � � � � � � � , � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � , � � rotate[i][j] � � � � 0°~360 ° � � � � � � � � � � , � � � � � � � � � � � � rotate[i][j] � � � � � � 400 � � � � � � P i � � Q j � � � � � � � � � � � � � � � � � �. � � � �,rotate[i][j]<400 � � � � P i � � Q j � � � � � � � � � � � � � � � � � � � � � � � � � � � �. � � � � P i � � Q j � � � � � � � � � � � � � � � � � � , � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � , � � � � � � (P i � � Q j) � � � � � � � � � � � � � � � � rotate[i][j] � � � � � � � � � � � � � � � � � � � � � �. � � R � � � � � � � � � � P i � � � � � � � � � �,r � � � � � � � � � � Q i � � � � � � � � � �. � � � � r � � R, � � � � (1) � � � � � � � � � � � � � � � � � � � � � �: 1 Diff _ dist

EXPERIMENTAL DETERMINATION OF EXCHANGE INTEGRALS IN MAGNETITE

De nouvelles expériences de diffusion inélastique de neutrons, au moyen d'un spectromètre à 3 axes, conduisent à une meilleure connaissance des intégrales d'échange dans la magnétite. De nouvelles branches ont été observées. Leurs fréquences peuvent être très bien ajustées dans le modèle d'Heisenberg, mais pas leurs intensités.New experiments of inelastic neutron scattering, by means of a triple-axis spectrometer, lead to a better knowledge of the exchange integrals in magnetite. New optical branches have been observed. Their frequencies may very well be fitted in the Heisenberg model, but not their intensities