title: Multiple Quantum Wells for PT-Symmetric Phononic Crystals.
abstract: We demonstrate that the parity-time symmetry for sound is realized in laser-pumped multiple-quantum-well structures. 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.
authors.affiliation: Ioffe Institute, St. Petersburg 194021, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Poshakinskiy
authors.affiliation: Ioffe Institute, St. Petersburg 194021, Russia.
authors.forename: A N
authors.initials: AN
authors.lastname: Poddubny
authors.affiliation: Centro Atomico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, 8400 San Carlos de Bariloche, Río Negro, Argentina.
authors.forename: A
authors.initials: A
authors.lastname: Fainstein