Determination of phonon lifetimes of individual surface semiconductor nano-structures

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Using a pump-probe method, we have succeeded in observing time-resolved STM light emission spectra. The STM light emission spectra of Sb2Te3 drastically varied in the optical delay time range from 13 ps to 0 ps. If one assumes that this variation is caused by phonons, the lifetime of phonons involved is reduced to around 6 ps. However, the mechanism that gives rise to such a variation has not been well understood yet. We carried out similar measurements for nanometer-scale structures, and found that the time resolved STM light emission spectra also show size effects.