1996 Fiscal Year Final Research Report Summary
Study of Wannier-Stark Effect in GaAs/AlGaAs Superlattices
| Project/Area Number |
07455140
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Osaka University |
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Principal Investigator |
HAMAGUCHI Chihiro Osaka University, Dept.of Electronic Engineering, Professor, 工学部, 教授 (40029004)
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| Co-Investigator(Kenkyū-buntansha) |
MOMOSE Hideki Osaka University, Low Temperature Center, Research Associate, 低温センター, 助手 (80260636)
MORIFUJI Masato Osaka University, Dept.of Electronic Engineering, Research Associate, 工学部, 助手 (00230144)
MORI Nobuya Osaka University, Dept.of Electronic Engineering, Lecturer, 工学部, 講師 (70239614)
TANIGUCHI Kenji Osaka University, Dept.of Electronic Engineering, Professor, 工学部, 教授 (20192180)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Semiconductor Superlattice / Wannier-Stark Effect / Electroreflectance / Zener Tunneling / Interband Transition / GAMMA-X Crossover |
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| Research Abstract |
In order to clarify the existense of a new phenomenon called "Wannier-Stark resonance" which was predicted by Di Carlo et al., we measured Zener current throught a pin diode with a (GaAs) _5/ (AlAs) _2 superlattice in the intrinsic layr. The sample we used were grown by the group of professor Weimann in Munchen Institute of Technology. We measured the derivative signals of Zener current by employing a standard lock-in technique and observed several peaks in the second derivative of Zener current. The peak positions agree well with theoretical values. Electroreflectance measurements were also carried out so as to clarify electronic band structure of the superlattice. Observed electroreflectance spectra clearly show the formation of Stark-ladders in the superlattice. Energies of the Stark-ladders show good correspondence to the peak voltages of the second derivative of the Zener current. These results strongly indicates that the peaks in the second derivative of Zener current arise from Stark-ladders in the superlattice.
In conclusion, we found an experimental evidence for the Wannier-Stark resonances.
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