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論文

Epitaxy of graphene on 3C-SiC(111) thin films on microfabricated Si(111) substrates

井出 隆之*; 川合 祐輔*; 半田 浩之*; 吹留 博一*; 小嗣 真人*; 大河内 拓雄*; 遠田 義晴*; 木下 豊彦*; 吉越 章隆; 寺岡 有殿; et al.

Japanese Journal of Applied Physics, 51(6), p.06FD02_1 - 06FD02_4, 2012/06

 被引用回数:7 パーセンタイル:30.56(Physics, Applied)

Epitaxy of graphene on 3C-SiC(111) formed on microfabricated Si(111) has been demonstrated. Through observations with optical microscopy, micro-Raman spectroscopy, low-energy-electron diffraction, and photoelectron spectroscopy, it is confirmed that the epitaxial graphene is Bernal-stacked with a buffer layer present between the graphene and the 3C-SiC film, which can lead SiC film, which can lead to opening of the band gap necessary for logic operations. The quality of the graphene is improved with the shrinkage of patterned terrace. These results indicate that GOS using substrate microfabrication is a promising method for the realization of graphene-based devices.

口頭

Current status for the search of time-reversal symmetry violation using compound nuclear reactions

遠藤 駿典; 木村 敦; 清水 裕彦*; 藤岡 宏之*; 井出 郁央*; 酒井 健二; 亀田 健斗*; 北口 雅暁*; 飯沼 昌隆*; 河村 しほり*; et al.

no journal, , 

The large enhancement of parity-violation of the weak interaction was found in nuclear reactions for several nuclei. The enhancement is explained as the mixing of parity-unfavored partial amplitudes in the entrance channel of the compound sates, s-p mixing. It is proposed that the time-reversal symmetry violation is also enhanced in compound nuclei by the same mechanism. We are preparing the time-reversal violation search based on this new approach. The time-reversal violation can be obtained by measuring the neutron spin behavior in compound nuclei using polarized neutron beam and polarized nuclear target. In parallel with the development of these instruments, we conduct precise measurements of compound nuclear reactions in J-PARC MLF. The enhancement factor of time-reversal violation can be estimated by measuring the angular correlation terms of (n,$$gamma$$) reactions according to the s-p mixing theory. We have measured the several correlation terms for several nuclei, such as $$^{139}$$La, $$^{117}$$Sn, and $$^{131}$$Xe, which are candidates of the target nuclei in the time-reversal violation search. Furthermore, we have already started the experiments with the polarized neutron beam and the polarized target. In this presentation, we will introduce the current status of the preparation for the search of time-reversal violation.

口頭

Measurement of spin-angular correlation terms in neutron induced reactions for search of time-reversal violation

遠藤 駿典; 藤岡 宏之*; 井出 郁央*; 飯沼 昌隆*; 伊東 佑起*; 亀田 健斗*; 河村 しほり*; 木村 敦; 北口 雅暁*; 奥 隆之; et al.

no journal, , 

複合核反応において空間反転対称性の破れが陽子陽子散乱反応と比較して、最大で約10$$^6$$倍程度増幅する ことが実験的に確認されている。これと同様の原理で時間反転対称性の破れも増幅することが示唆されており、我々は複合核反応を用いて、標準模型を超える時間反転対称性の破れの探索を計画している。近年はJ-PARC・MLF・ANNRIにて、中性子入射反応におけるスピン-角相関項の測定を行い、時間反転対称性の破れの増幅度の評価や、増幅理論の実験的検証を進めている。本講演ではこれら相関項測定の結果及び現状を中心に、最近の成果と今後の展望を紹介する。

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