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タイトル: Observation of spontaneous spin-splitting in the band structure of an n-type zinc-blende ferromagnetic semiconductor
著者: Anh, Le Duc
Hai, Pham Nam
Tanaka, Masaaki
キーワード: Electronic devices
発行日: 2016年12月19日
出版者: Nature Publishing Group
掲載誌情報: Le Duc Anh, Pham Nam Hai and Masaaki Tanaka, "Observation of spontaneous spin-splitting in the band structure of an n-type zinc-blende ferromagnetic semiconductor", Nature Communications Online Edition: 2016 /12/19 (Japan time), doi:10.1038/ncomms13810.
関連URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/study-picks-up-large-spontaneous-spin-splitting-in-the-energy-band-structure.html
抄録: Large spin-splitting in the conduction band and valence band of ferromagnetic semiconductors, predicted by the influential mean-field Zener model and assumed in many spintronic device proposals, has never been observed in the mainstream p-type Mn-doped ferromagnetic semiconductors. Here, using tunnelling spectroscopy in Esaki-diode structures, we report the observation of such a large spontaneous spin-splitting energy (31.7–50 meV) in the conduction band bottom of n-type ferromagnetic semiconductor (In,Fe)As, which is surprising considering the very weak s-d exchange interaction reported in several zinc-blende type semiconductors. The mean-field Zener model also fails to explain consistently the ferromagnetism and the spin-splitting energy of (In,Fe)As, because we found that the Curie temperature values calculated using the observed spin-splitting energies are much lower than the experimental ones by a factor of 400. These results urge the need for a more sophisticated theory of ferromagnetic semiconductors.
内容記述: UTokyo Research掲載「スピン状態によって大きなエネルギー差が自発的に生ずるエネルギー帯構造を観測」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/study-picks-up-large-spontaneous-spin-splitting-in-the-energy-band-structure.html
UTokyo Research "Study picks up large spontaneous spin splitting in the energy band structure" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/study-picks-up-large-spontaneous-spin-splitting-in-the-energy-band-structure.html
URI: http://hdl.handle.net/2261/61295
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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