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タイトル: Sudden restoration of the band ordering associated with the ferromagnetic phase transition in a semiconductor
著者: Muneta, Iriya
Ohya, Shinobu
Terada, Hiroshi
Tanaka, Masaaki
キーワード: Condensed matter
Physical sciences
Materials science
発行日: 2016年6月28日
出版者: Nature Publishing Group
掲載誌情報: Iriya Muneta, Shinobu Ohya, Hiroshi Terada, and Masaaki Tanaka, "Sudden restoration of the band ordering associated with the ferromagnetic phase transition in a semiconductor", Nature Communications: 2016/06/28 (Japan time), doi:10.1038/ncomms12013.
関連URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/new-discovery-in-semiconductor-physics.html
抄録: The band ordering of semiconductors is an important factor in determining the mobility and coherence of the wave function of carriers, and is thus a key factor in device performance. However, in heavily doped semiconductors, the impurities substantially disturb the band ordering, leading to significant degradation in performance. Here, we present the unexpected finding that the band ordering is suddenly restored in Mn-doped GaAs ((Ga,Mn)As) when the Mn concentration slightly exceeds B0.7% despite the extremely high doping concentration; this phenomenon is very difficult to predict from the general behaviour of doped semiconductors. This phenomenon occurs with a ferromagnetic phase transition, which is considered to have a crucial role in generating a well-ordered band structure. Our findings offer possibilities for ultra-high-speed quantum-effect spin devices based on semiconductors.
内容記述: UTokyo Research掲載「半導体の基礎物理学で新たな発見」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/new-discovery-in-semiconductor-physics.html
UTokyo Research "New discovery in semiconductor physics" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/new-discovery-in-semiconductor-physics.html
URI: http://hdl.handle.net/2261/59539
ISSN: 2041-1723
出現カテゴリ:014 自然科学
1132210 学術雑誌論文


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