Persons

For calculation and constructing the devices of nanoelectronics and nanophotonics, in which graphenes and graphenes-like 2D nanoallotropes of carbon, silicon and binary compounds of АВ type are used, the knowledge of elastic characteristics and depending on them piezoelectric, photo-elastic and other properties of 2D materials is significant. The method for determining isothermal values of the force constants, elastic rigidities, Young’s modulus and Poisson’s ratio for 2D nanoallotropes of the elements of IV group of the periodic table and binary compounds of АВ type, simple and convenient for engineering calculations, has been offered. The method is based on the modified by S.Yu. Davydov method, connecting the Harrison orbitals and R.Keating models the descriptions of elastic properties of such materials. It has been shown that the method allows to provide the estimated calculations for the elastic properties both, the well-known synthesized 2D crystal structures, as well as for the theoretically constructed structures. It has been shown that along with graphene, the monolayer hexagonal boron nitride and other binary compounds of АВ type in a form of 2D nanoallotropes of different symmetry, which, besides, are piezoelectric, can become very promising. It expands the range of possible practical applications of the studied materials (C, Si, BN, GaN, AlN, GaP) both with the graphene-like and more complex structure. The results of the work can be used when developing acoustoelectronic delay lines of terahertz frequency range, piezoelectric transduces for elastic waves excitation and receiving in the nanoscale 2D acoustic lines and piezoelectric sensors.

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Graphene and isomorphic to it 2D hexagonal boron nitride are the promising materials for using in nanoacoustics. Therefore, a more detailed study on the possibilities of creating the Plasmon-acoustic transducers for nanoacoustics with corresponding numerical estimates of their technical characteristics is urgent. In the paper, theoretically and by numerical estimates the fundamental possibility of Plasmon-acoustic transducers creating for nanoacoustic devices, operating in the terahertz frequency range has been justified. As the model being analyzed is a Plasmon-acoustic transducer, consisting of two subsystems: piezoelectric and Plasmon-polaritonic one, has been studied. The piezoelectric subsystem is made in the form of hexagonal boron nitride nanoribbon - a sound wire, the end part of which serves as a piezoelectric transduecer, exciting the elastic waves of terahertz range in the sound wire. The sound wire overlaps with the Plasmon-polaritonic subsystem in the form of a graphene nanoribbon, in which the surface plasmon-polaritons of TM polarization propagate. The introduced electrical impedance of the piezoelectric subsystem and the characteristic impedance have been calculated. It has been shown that their values are such, that it is possible to ensure optimal coordination of a load (sound wire) with Plasmon-polaritonic waveguide. It has been determined that graphene nanoplasmonics based on piezoelectric planar boron nitride are well combined with each other, which opens wide the opportunities for creating a new class of nanoelectronic devices.

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