| Project/Area Number |
12650318
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
KOTERA Nobuo Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, Professor, 情報工学部, 教授 (60215291)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Koichi Hiroshima City University, Faculty of Information Sciences, Associate Professor, 情報科学部, 助教授 (40236584)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Nanometer / Quantum Confined States / Quantum Well / Eigen State Energy / Wave Function / Effective Mass / Compound Semiconductor / Photonic Device / 量子閉じこめ |
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| Research Abstract |
It has been investigated the optical properties of InGaAs/InAlAs quantum well (QW) and magneto-optical properties of InGaAs/InAlAs QW as well as InGaAs/AlAsSb QW, in order to clarify the design rules of photonic devices applicable to 1.5-micron-band contemporary "optical telecommunication systems." The QW structures confines electrons inside the two-to-twenty nano-meter thick QW potentials electronically.
A series of eigen-state energies and related effective masses of conduction electrons were obtained after analysis of measured photo-current spectra, optical transmission spectra and related Stark effect to identify inter-band optical transitions. Electron effective masses normal to the QW plane was first observed systematically as a function of electron kinetic energy. Optical absorption was theoretically calculated using effective masses and wave functions in QWs to get good coincidence with experiments.
Cyclotron resonance energies as a function of magnetic field and magneto-photo-luminescence spectra were measured to obtain cyclotron effective masses or Landau-level masses. Electron masses parallel to the QW plane was investigated.
Kane's three-level band theory was successfully applied to the QW structure, which explained experiments in strong magnetic fields or zero-magnetic filed at low and high temperatures. Eigen-energies in confined states in QWs could be described by the theory of "nonparabolic conduction subband" intrinsic to the InGaAs material itself. Applicability of band theory in the nanoscale substance was experimentally surveyed.
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