Field Emission of Spin-Polarized Electrons Extracted from Photoexcited GaAs Tip
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概要
- 論文の詳細を見る
A pyramidal-shaped GaAs (tip-GaAs) photocathode for a polarized electron source (PES) was developed to improve beam brightness and negative electron affinity (NEA) lifetime by field emission. The emission mechanism also enables the photocathode to extract electrons from the positive electron affinity (PEA) surface into vacuum, and alleviates the NEA lifetime problem. The measured electrical characteristics of tip-GaAs and its polarization exhibited distinctive field-emission behavior. The polarization of the electron beam extracted from tip-GaAs was 20–38% under irradiation with circularly polarized light of 700–860 nm, and the peak polarization was $37.4\pm 1.4$% at a wavelength of 731 nm. These experimental results indicate that spin-polarized electrons can be extracted from the conduction band into vacuum by a field-emission mechanism. This, in turn, shows that this type of photocathode has the prospect of generating a low-emittance spin-polarized electron beam.
- 2006-08-15
著者
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NAKANISHI Tsutomu
Graduate School of Science, Nagoya University
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Yamaguchi Koichi
Department of Cardiology, Shin-Nittetsu Muroran General Hospital
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Okumi Shoji
Graduate School Of Science Nagoya University
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Kuwahara Makoto
Graduate School Of Science Nagoya University
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Yamamoto Naoto
Graduate School Of Engineering Nagoya University
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Yamamoto Masahiro
Graduate School Of Dentistry (orthodontics) Osaka Dental University
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Yamaguchi Koichi
Department of Electronic Engineering, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
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Kuwahara Makoto
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Miyamoto Masaharu
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Yasui Ken-ichi
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Morino Takanori
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Sakai Ryousuke
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Tamagaki Kuniaki
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Okumi Shoji
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Yamamoto Naoto
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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Nakanishi Tsutomu
Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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