1988 Fiscal Year Final Research Report Summary
Ultrafast Tunneling Spectroscopy of Semiconductor Superlattices
| Project/Area Number |
62460022
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性
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| Research Institution | Institute of Physics, University of Tsukuba |
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Principal Investigator |
MASUMOTO Yasuaki Institute of Physics, University of Tsukuba, 物理学系, 助教授 (60111580)
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| Project Period (FY) |
1987 – 1988
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| Keywords | tunneling / トンネル過程 / 光非線型性 / 励起子 / ΓーX谷間散乱 / 超高速ポンプ・プローブ分光法 |
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| Research Abstract |
The competition bewteen tunneling (vertical transport) and relaxation (exciton formation) of photo-generated carriers in GaAs-Al_<0.29>Ga_<0.71>As quantum wells in an electric field has been studied by using population mixing and time-correlated single photon conuting techniques.
Secondary, we have studied the optical properties of Al_xGa_<1-x>As-AlAs ternary alloy multi-quantum-well structures around two r-X crossovers by means of photoluminescence and absorption saturation.
Finally, the interlayer r-X scattering rate of photoexcited electrons was measured in staggered-alignment Al_<0.34>Ga_<0.66>As-AlAs ternary alloy multi-quantum-well structures for the first time. The scattering process was directly probed by the femtosecond pump-and probe spectroscopy.
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