2012 Fiscal Year Final Research Report
Determination of phonon lifetimes of individual surface semiconductor nano-structures
| Project/Area Number |
22340075
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Tohoku University |
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Principal Investigator |
UEHARA Yoichi 東北大学, 電気通信研究所, 教授 (30184964)
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| Co-Investigator(Renkei-kenkyūsha) |
KUWAHARA Masashi 独立行政法人産業技術総合研究所, 光技術部門, 主任研究員 (60356954)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 時間分解計測 / 原子位置分解能 / STM / 発光計測 |
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| Research Abstract |
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.
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