Multiple quantum wells for PT-symmetric phononic crystals
arXiv:1606.09125 · doi:10.1103/PhysRevLett.117.224302
Abstract
We demonstrate that the parity-time symmetry for sound is realized in the laser-pumped multiple-quantum-well structure. Breaking of the parity-time symmetry for the phonons with wave vectors corresponding to the Bragg condition makes the structure a highly-selective acoustic wave amplifier. Single-mode distributed feedback phonon lasing is predicted for structures with realistic parameters.
5 pages, 4 figures + supplement
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