arXiv subjects
Publications and source records attributed to A. Yafyasov.
The quantum graph plays the role of a solvable model for a two-dimensional network. Here fitting parameters of the quantum graph for modelling the junction is discussed, using previous results of the second author.
A design of the resonance spin finter is suggested in form of a quantum well with three quantum wires attached. Explicit formula is suggested for transmission coefficients accross the well in terms of the resonance eigenfunction of the Schredinger operator on the well with Rashba spin-orbital interaction.
Design of a three-terminal Quantum Switch is suggested in form of a network consisting of a circular quantum well and four semi-infinite single mode quantum wires attached to it. It is shown that in resonance case, when the Fermi level in the wires is close to some energy level in the well, the magnitude of the governing electric field on the well may be specified in such a way that the quantum current across the switch from the up-leading wire to the outgoing wires (terminals) can be controlled via rotation of the orthogonal projection of the governing electric field onto the plane of the device. The details of design of the switch are chosen in dependence of desired working temperature, available Fermi level and effective mass of electron. The speed of switching is estimated. A solvable model of the switch in form of a one-dimensional graph with a resonance vertex is suggested.
Two types of optically manipulated quantum electronic devices are considered: a quantum dot and a finite periodic molecular chain, with the period doubled under resonance optical excitation. The stability of the working regimes of the devices in large scale of temperatures is discussed. Some motivation in favor of the molecular chain is suggested. A class of materials, which can be used for producing this device is discussed.