Determination of phonon lifetimes of individual surface semiconductor nano-structures
Project/Area Number |
22340075
|
Research Category |
Grant-in-Aid for Scientific Research (B)
|
Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Condensed matter physics I
|
Research Institution | Tohoku University |
Principal Investigator |
UEHARA Yoichi 東北大学, 電気通信研究所, 教授 (30184964)
|
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)
|
Project Period (FY) |
2010 – 2012
|
Project Status |
Completed (Fiscal Year 2012)
|
Budget Amount *help |
¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
Fiscal Year 2012: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2011: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2010: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
|
Keywords | 時間分解計測 / 原子位置分解能 / STM / 発光計測 / 半導体 / フォノン / ナノ構造 / 寿命時間 / ナノ計測 / 発光分光 |
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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Report
(4 results)
Research Products
(10 results)