Long-lived optical phonons in ZnO studied with impulsive stimulated Raman scattering

Abstract

The anharmonic properties of the low-frequency E2 phonon in ZnO were measured using impulsive stimulated Raman scattering. At 5 K, the frequency and lifetime are (2.9787 +/- 0.0002) THz and (211 +/- 7) ps. The unusually long lifetime and the high accuracy in the determination of the frequency hold promise for applications in metrology, quantum computation and materials characterization. The temperature dependence of the lifetime is determined by two-phonon up-conversion decay contributions, which vanish at zero temperature. Results suggest that the lifetime is limited by isotopic disorder and that values in the nanosecond range may be achievable in isotopically-pure samples.

References in corpus (2)

• Entanglement formation and violation of Bell's inequality with a semiconductor single photon source
• Femtosecond data storage, processing and search using collective excitations of a macroscopic quantum state

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