Open AccessТопологические моды в неэрмитовых фононных кристаллах, индуцированных оптически в массиве квантовых ям
Author(s) -
А.В. Пошакинский,
А.Н. Поддубный
Publication year - 2021
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2021.04.50721.249
Subject(s) - physics , excitation , dispersion (optics) , attenuation , acoustic wave , optics , resonance (particle physics) , acoustics , computational physics , atomic physics , quantum mechanics
We study theoretically propagation of acoustic waves in an array of quantum wells, where a spatially modulated amplification and attenuation of sound is realized by optical excitation with a frequency close to the exciton resonance. The dispersion of sound waves near Bragg resonances corresponding to the modulation wave vector is calculated. The appearance of "imaginary" stop bands, where the imaginary parts of the Bloch mode frequencies are split, is described. The emergence of acoustic topological modes at the edge of the structure is demonstrated.