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

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

2004-06-28

arxiv.org/abs/cond-mat/0406686v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevB.71.205211

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.

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