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The new concept of metatronics is merging with graphene metamaterials. Our approach to “graphene metamaterials” includes “metamaterial treatment” of beams of electrons (BE) (see also electron density lenses) with a wide range of control of wave characteristics; means of influencing the BE characteristics in dielectric-graphene (DG) and carbon nano-tube-graphene-dielectric structures through the electron...
The ballistic electron transport in inhomogeneous graphene is considered. The most general case when either electric field or magnetic one, the exchange interaction coefficient or magnetization, or all of these coefficients altogether could have proper inhomogeneities. As a result, the effective way of controlling electron beam transport is provided and a lot of possibilities of spin transport are...
The application of TF method to calculate the electron spectrum in highly doped n-Si quantum wires is presented under finite temperatures, where the many-body effects, like exchange, are taken into account. The electron potential energy is calculated from a simple separate equation. Then the energy sub-levels and wave functions are simulated from the Schrödinger equation. Peculiarities of solving...
Terahertz radiation generation by using the natural modes of solid body has been investigated. The numerical simulation of instability of terahertz range optical phonons in semiconductor structures with quantum wells during the drift of two-dimensional electron gas was performed. The main obstacle of implementing the specified instability is the heating of electron gas during its drift. That is why...
Starting from the kinetic expression of 2D nonlinear electric current in the graphene, the new equation is derived, to simulate nonlinear THz electromagnetic wave propagation through layered graphene - dielectric lossy structures. A possibility of nonlinear switching of short THz pulses in multilayer structure is shown.
The combined method to investigate the electron spectrum of single n-type δ-doped quantum wells in silicon is proposed. It is based on computing the electron potential energy by means of the Thomas-Fermi method at finite temperatures; then the obtained potential energy is applied to the iteration procedure with solving the Schrödinger equations for the electron spectrum and the Poisson one for the...
The amplification of optical phonons both in the bulk semiconductors (the drift of 3D electron gas) and in heterostructures (2D gas) is investigated theoretically. The principal obstacle for observing the amplification of the optical phonons is the heating of the electron gas under drifting. Therefore the low temperatures T < 77 K are considered, and the electron gas is assumed as degenerated...
Nonlinear propagation of optical pulses through the periodic structure with and without defects is investigated numerically. A stack of alternating linear and cubically nonlinear layers of submicron thicknesses is considered. The simulations are based on a modified equation for the pulse envelope and modified boundary conditions, where diffraction of the pulse has been taken into account. The results...
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