1993 Fiscal Year Final Research Report Summary
Control of resonant electron capture in semiconductor quantum structures
| Project/Area Number |
04452085
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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 |
Applied materials
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SHIRAKI Yasuhiro The University of Tokyo, Research Center for Advanced Science and Technology, Professor, 先端科学技術研究センター, 教授 (00206286)
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| Co-Investigator(Kenkyū-buntansha) |
FUKATSU Susumu The University of Tokyo, Research Center for Advanced Science and Technology, As, 先端科学技術研究センター, 助手 (60199164)
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| Project Period (FY) |
1992 – 1993
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| Keywords | resonant capture / heterointerface / tunnel barrier / electron-wave reflectivity |
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| Research Abstract |
The resonant carrier capture in AlGaAs/GaAs QW structures was systematically investigated by both steady-state and time-resolved photoluminescence. The new structure of QWs with AlAs tunnel barriers was proposed to enhance the resonant effect. It has been clearly revealed that the electron capture efficiency is increased and the electron capture time is decreased due to the resonant electron capture. It has been also found that the insertion of tunnel barriers at QW heterointerfaces drastically leads to resonance enhancement. We demonstrate an optical analogy of the resonant carrier capture, in terms of electron wave reflectivity, on the basis of the effective mass approximation, which well explains the experimental results.
Importantly, the resonant electron capture is expected to be more prominent in low-dimensional quantum structures such as quantum well wires and quantum well boxes. In this sense, the present work will be a cornerstone for future work rying to shed lights on carrier capture in these sophisticated quantum structures. We believe that the control of the resonant electron capture will be regarded as a key issue so that we can tailor the carrier collection efficiency in such low-dimensional structures.
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