Dynamic conductivity of symmetric three-barrier plane nanosystem in constant electric field

Abstract

The theory of dynamic conductivity of nanosystem is developed within the model of rectangular potentials and different effective masses of electron in open three-barrier resonance-tunnel structure in a constant homogeneous electric field.The application of this theory for the improvement of operating characteristics of quantum cascade laser active region (for the experimentally investigated In 0.53 Ga 0.47 As/In 0.52 Al 0.48 As heterosystem) proves that for a certain geometric design of nanosystem there exists such minimal magnitude of constant electric field intensity, at which the electromagnetic field radiation power together with the density of current flowing through the separate cascade of quantum laser becomes maximal.

Non-perturbation theory of electronic dynamic conductivity for two-barrier resonance tunnel nano-structure

“…It is evident that in linear approximation over the electromagnetic field intensity, the coefficients B ± 0 , A ± 4 are also linear. Consequently, in this approximation, (the same in PT [4][5][6][7][8][9][10][11][12][13][15][16][17][18][19]) the dynamic conductivity is independent of .…”

“…The theory of dynamic conductivity established in references [16][17][18][19] for the open two-and three-barrier RTS is based, as a rule, on a more realistic model but it is so complicated compared to the δ-barrier model that it is practically impossible to leave the framework of weak signal approximation. Nevertheless, the development of experimental capabilities makes the problem of strong interaction of electronic currents and electromagnetic field in RTS more and more urgent.…”

Quasi-stationary states of electrons interacting with strong electromagnetic field in two-barrier resonance tunnel nano-structure

“…The theory of ballistic and non-ballistic transport of electrons through the RTS was developed in detail mainly within the approximation of a small amplitude of high-frequency electromagnetic field [8][9][10][11][12][13]. Also, only linear terms over the intensity of an electric field were preserved in the Hamiltonian and wave functions.…”