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Development of spin-polarized positronium time-of-flight spectroscopy
https://repo.qst.go.jp/records/81022
https://repo.qst.go.jp/records/81022df938bdc-b7a2-4b08-a55b-78d0f4f82185
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-10-30 | |||||
| タイトル | ||||||
| タイトル | Development of spin-polarized positronium time-of-flight spectroscopy | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Maekawa, Masaki
× Maekawa, Masaki× Miyashita, Atsumi× Kawasuso, Atsuo× Maekawa, Masaki× Miyashita, Atsumi× Kawasuso, Atsuo |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Positronium (Ps) is a quasi-stable bound system consisting of an electron and a positron. From the annihilation ratio of Ps decay, the spin polarization of electrons containing in Ps can be determined. Since Ps is formed only at a topmost surface region with a low-electron density, the spin polarization obtained by this method is not affected by the bulk condition. If the energy-resolved and spin-polarized Ps annihilation spectroscopy is available, one can obtain the spin-polarized electron density-of-states (DOS) associated with only the top-surface layer of materials. We have been developing SP-PsTOF apparatus for the energy-resolved and spin-polarized Ps annihilation spectroscopy. From the SP-PsTOF spectrum obtained for a Ni film, the negative polarization near the Fermi level was obtained. This result is reproduced by a theoretical calculation. The SP-PsTOF method is expected to be most powerful tool for the study of materials for spintronics application. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 4th QST International Symposium -Innovation from Quantum Materials Science- | |||||
| 発表年月日 | ||||||
| 日付 | 2020-11-04 | |||||
| 日付タイプ | Issued | |||||
