Wave-vector-dependent spin filtering and spin transport through
... region, whereas the spin-up modes only exist as evanescent waves and their transmission through the structure is exponentially suppressed with the distance between the barriers. Formally, this can easily be seen from the expression of the x component of the momentum in the region C, kx = 冑共E − x兲 ...
... region, whereas the spin-up modes only exist as evanescent waves and their transmission through the structure is exponentially suppressed with the distance between the barriers. Formally, this can easily be seen from the expression of the x component of the momentum in the region C, kx = 冑共E − x兲 ...
Introduction - Essentials Education
... Quantities that have size or magnitude only are called scalar quantities. Examples include mass, time, energy and temperature. Quantities that have both magnitude and direction are called vector quantities. One example is force (a push or a pull). This is because an object can be pulled or pushed in ...
... Quantities that have size or magnitude only are called scalar quantities. Examples include mass, time, energy and temperature. Quantities that have both magnitude and direction are called vector quantities. One example is force (a push or a pull). This is because an object can be pulled or pushed in ...
Woodward effect
The Woodward effect, also referred to as a Mach effect, one of at least three predicted Mach effects, is part of a hypothesis proposed by James F. Woodward in 1990.The hypothesis states that transient mass fluctuations arise in any object that absorbs internal energy while undergoing a proper acceleration. Harnessing this effect could generate a thrust, which Woodward and others claim to measure in various experiments. If proven to exist, the Woodward effect could be used in the design of spacecraft engines of a field propulsion engine that would not have to expel matter to accelerate. Such an engine, called a Mach effect thruster (MET), would be a breakthrough in space travel. So far, no conclusive proof of the existence of this effect has been presented. Experiments to confirm and utilize this effect by Woodward and others continue.