Электрозвуковые Волны В PT-симметричной Структуре Пьезоэлектриков Вблизи Особой Точки

The spectral properties of electrosound waves in the gap of PT-symmetric piezoelectrics of symmetry class 6 are investigated theoretically. It is found that at a certain level of loss and gain in piezoelectrics, the symmetric and antisymmetric modes are coupled. The coupling point defines an exceptional point of PT-symmetric structure. It is shown that the frequency dependence of the amplitude at the exceptional point has an extremely narrow resonance peak, which opens up the possibility of creating supersensitive sensors based on PT-symmetric physical structures.