Acoustic properties of a dielectric with cavities in a polarizing electric field

Shevyakhov, N. S.

doi:10.1134/1.1608986

Cited by 1 publication

(1 citation statement)

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“…As a rule, the amplification effect due to the charge carrier drift current is observed in a thin boundary layer of the order of a wavelength. However, it was shown in [36] that amplified electroacoustic waves could have the character of volume propagation. A small difference from the spectrum of electroacoustic waves at the free boundary of the piezoelectric and a small propagation angle (several degrees from the surface of the piezoelectric) can allow this wave to be excited in the gap of two piezoelectrics, either with amplification or attenuation, changing the direction of the electric current in the semiconductor.…”

Section: Statement Of the Problemmentioning

confidence: 99%

Gap electroacoustic waves in PT-symmetric piezoelectric heterostructure near the exceptional point

Вилков

Byshevski-Konopko

Kalyabin

et al. 2023

J. Phys.: Condens. Matter

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The spectral properties of gap electroacoustic waves in a PT-symmetric structure of piezoelectrics of symmetry class 6mm separated by a gap are theoretically investigated. The spectra were calculated for lead germanate (non-zero transverse piezoactivity) and barium titanate (symmetry class 4mm - zero transverse piezoactivity). It has been established that at a certain level of losses and gain in piezoelectrics, the symmetric and antisymmetric modes intersect. The intersection point determines the singular point of the PT-symmetric structure. Beyond this point, there is a violation of the symmetric and antisymmetric distribution of electric fields in the gap of the slotted structure of two identical piezoelectrics, which is confirmed by the calculation of the electric field profiles. It is shown that the dependence of the amplitude on the frequency at an exceptional point has an extremely narrow resonance peak, which opens up the possibility of creating supersensitive sensors based on PT-symmetric physical structures.

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Section: Statement Of the Problemmentioning

confidence: 99%