Collisionless damping of surface plasma oscillations and possibilities of its reverse at the interaction with charged particle flows
This paper is devoted to investigation of the interaction between the charged particle flows passing through the boundary of plasma-like media and surface oscillations.
Interaction of hot electrons with two-dimensional gas in semiconductor superlattices
Abstract We have studied the interaction of two-dimensional plasmons with a beam of charged particles consisting of hot electrons arising from the effect of the electric field in a two-layer heterostructure and a superlattice. The spectra of the eigen oscillations are obtained. Kinetic equations describing the wave-particle interactions are constructed. The instability growth rates are calculated for transverse oscillations. Numerical estimates are given for the structures on the basis of semiconductor, compounds. Frequency and energetic differences are analyzed for semiconductor two-layer heterostructures and superlattices having this heterostructure as a periodic element.
High field hot electron transport through AlxGa1-xAs multiquantum well superlattices
We report the first measurement of the high electric field hot electron mean free path L for transport through AlxGa1-xAs multiquantum well superlattices by fabricating a novel detector whose γ = 10μm infrared sensitivity critically depends on hot electron transport. We find L to be extremely large namely L = 4500A for a 50 period superlattice composed of 72A GaAs quantum wells separated by 133A Al0.38Ga0.62As tunneling barriers (i.e., L = 22 periods). In addition, we have achieved, for the first time, an avalanche gain of 300% at 10μm in these quantum well superlattices. The electrons are generated by resonant intersubband tunneling and then avalanche by hot electron impact ionization of carriers out of the quantum wells. By analyzing these measurements we find a highly nonthermal peaked electron distribution with a relatively narrow energy width of 60 meV.