Generation of highly spin-polarized electron beams by using two-photon excitation process from GaAs semiconductors.
Project/Area Number |
21740175
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Single-year Grants |
Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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Research Institution | Nagoya University |
Principal Investigator |
YAMAMOTO Naoto Nagoya University, 工学研究科, 助教 (60377918)
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Project Period (FY) |
2009 – 2010
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Project Status |
Completed (Fiscal Year 2010)
|
Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2009: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
|
Keywords | 加速器 / スピン偏極電子源 / ビーム物理 / 半導体 / スピン偏極電子 / 電子源 |
Research Abstract |
In case that the laser power was around the threshold power of two photon excitation from GaAs semiconductors, it is found that the measured electron spin polarization (ESP) was only around 20%, which is much lower than estimated value, which is higher than 90%. It is considered that the ESP degradation is caused by the exists of harmonics in excitation laser and impurity energy states in GaAs semiconductors. To obtain higher than 90% ESP, we have to make more complicate researches & developments for laser system and sample preparation.
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Report
(3 results)
Research Products
(18 results)
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[Journal Article] Strain of GaAs/GaAsP Superlattices Used as Spin-Polarized Electron Photocathodes, Determined by X-Ray Diffraction2010
Author(s)
T.Saka, Y.Ishida, M.Kanda, X.G. Jin, Y.Maeda, S.Fuchi, T.Ujihara, Y.Takeda, T.Matsuyama, H.Horinaka, T.Kato, N.Yamamoto, A.Mano, Y.Nakagawa, M.Kuwahara, S.Okumi, T. Nakanishi, M.Yamamoto, T.Ohshima, T.Kohashi, M.Suzuki, M.Hashimoto, T.Yasue, T.Koshikawa
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Journal Title
e-Journal of Surface Science and Nanotechnology 8
Pages: 125-130
NAID
Related Report
Peer Reviewed
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[Journal Article] Real Time Magnetic Imaging by Spin-Polarized Low Energy Electron Microscopy with Highly Spin-Polarized and High Brightness Electron Gun2010
Author(s)
M.Suzuki, M.Hashimoto, T.Yasue, T.Koshikawa, Y.Nakagawa, A.Mano, N. Yamamoto, M.Yamamoto, T.Konomi, M.Kuwahara, S.Okumi, T.Nakanishi, X.G.Jin, T.Ujihara, Y.Takeda, T. Kohashi, T.Ohshima, T.Saka, T.Kato, H.Horinaka
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Journal Title
Applied Physics Express 3
Pages: 26601-26601
NAID
Related Report
Peer Reviewed
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[Journal Article] High Brightness and high polarization electron source using transmission photocathode2009
Author(s)
N.Yamamoto, X.G.Jin, A.Mano, Y. Nakagawa, T.Nakanishi, T.Ujihara, S.Okumi, M.Yamamoto, T.Konomi, Y.Takeda, T.Ohshima, T.Saka, T.Kato, H.Horinaka, T.Yasue, T. Koshikawa
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Journal Title
Proceedings of SPIN 2008 AIP
Pages: 1052-1056
Related Report
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[Journal Article] Status of the high brightness polarized electron source and experimental result as a Spin-LEEM electron source
Author(s)
N.Yamamoto, X.G.Jin, A.Mano, M. Suzuki, M.Hashimoto, T.Yasue, T.Koshikawa, T.Ujihara, Y.Takeda, T.Ohshima, T.Saka, T.Kato, H.Horinaka S.Okumi, T.Nakanishi
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Journal Title
Proceedings of SPIN 2010, Journal of Physics : Conference Series, accepted
Related Report
Peer Reviewed
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