1998 Fiscal Year Final Research Report Summary
Electric field control of opical transitions in semiconductor superlattice spaces
| Project/Area Number |
09831003
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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 |
極微細構造工学
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| Research Institution | KYUSHU INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
FUJIWARA Kenzo Kyushu Institute of Technology, Dept.of Electrical Engineering, Professor, 工学部, 教授 (90243980)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEUCHI Masaichi Kyushu Institute of Technology, Dept.of Electrical Engineering, Assistant, 工学部, 助手 (60284585)
KAWASHIMA Kenji Kyushu Institute of Technology, Dept.of Electrical Engineering, Associate Profes, 工学部, 助教授 (50284584)
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| Project Period (FY) |
1997 – 1998
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| Keywords | semiconductor superlattice / quantum structure / Photocurrent spectra / optical transition / Stark effect / excitonic effect / photoelectric effect / resonant tunneling |
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| Research Abstract |
In order to pursue the electric-field controlability of optical transitions in semiconductor quantum structures, three different-types of GaAs/AIAs superlattices have been investigated and the following results are obtained.
1. Electric field effects on optical transitions in an asymmetric double-well superlattice
For a new-type biperiodic superlattice consisting of asymmetric double-well pairs in a unit period, anticrossings as well as excitonic effects of the optical transitions have been observed and clarified, originating from the resonant coupling between the Stark-ladder states belonging to the wider and narrower wells.
2. Electric field effects on optical transitions in a perfectly asymmetric double period superlattice
For a new-type of perfectly asymmetric superlattice having the well and barrier biperiodicity, the observed transition energy fan diagram and enhanced anticrossings due to stronger couplings through the thinner barriers have been elucidated in the light of theoretical calculations of the confined eigenenergies and the oscillator strengths based on the transfer matrix method.
3. Electric field control of optical transitions due to interactions between superlattice ladder and single quantum well states
Electron as well as hole resonances controlled by the applied electric field have been observed in the optical absorption spectra of a monoperiodic superlattice which contains an isolated single quantum well in the middle, and analyzed with the help of transfer matrix calculations within the effective mass approximation.
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