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Phonons assist in creating an excitation-dominated state, or population inversion, in a single quantum dot—an effect that could be used to realize single-photon sources.
Phonon lasing—coherent amplification of phonons by stimulated emission—has been achieved in a purely acoustic analog of a three-level laser scheme.
Radiation pressure and thermal effects come together in a new technique for manipulating particles inside a hollow-core photonic crystal fiber.