High-frequency properties of double-well nanostructures

On the active conductivity of a three-barrier resonant-tunneling structure and optimization of quantum cascade laser operation

“…Among the theoretical studies in which various properties of multilayer RTSs were most thoroughly and deeply studied, the works by Pashkovskii and Golanta [9][10][11][12] and also Elesin with collaborators [13][14][15] should be noted. Although the active elec tronic conductivity of electron fluxes through RTSs was studied mostly in the ballistic mode in the series of mentioned works, and the δ barrier model of multi layer nanosystems was studied in most cases, the theo retical models and methods developed there appeared to not only adequately explain many QCL properties, but also made it possible to determine at least the qual itatively predictable properties of some nanodevices in the case of the use of a model with rectangular wells and barriers [16].…”

Evolution of electron spectrum in symmetric two-barrier open nanostructure under the influence of strong electromagnetic field

“…Here, the Hamiltonian of the system contains the electron kinetic energy (the first term), the electron potential energy written in a typical δ-barrier approximation (see [5][6][7][8][9][10][11][12]),…”

“…In the majority of the relevant theoretical papers [5][6][7][8][9], a so-called small signal approximation has been used. In its frames, only terms linear in the electric intensity of electromagnetic field are maintained in the Hamiltonian and the wave functions.…”

Electronic Conductivity in Open Cylindrical Two-Barrier Symmetric Resonance Tunnel Structure

“…The mathematical complication is that in the majority of theoretical papers [10][11][12][13][14][15][16][17] simplified models of nano-systems (mainly the plane ones) are used. These models are based at the δ-barrier approximation of RTS rectangular potential barriers.…”