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Evolution of elementary excitations at a doped polar semiconductor surface in a depletion-layer formation process
https://iwate-u.repo.nii.ac.jp/records/10109
https://iwate-u.repo.nii.ac.jp/records/10109284d472d-a8c4-495e-9487-bfea910ecf8c
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
prb-v63i16p165322.pdf (409.2 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||||
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| 公開日 | 2012-01-10 | |||||||
| タイトル | ||||||||
| タイトル | Evolution of elementary excitations at a doped polar semiconductor surface in a depletion-layer formation process | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||
| 資源タイプ | journal article | |||||||
| 著者 |
INAOKA, Takeshi
× INAOKA, Takeshi
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| 著者(機関) | ||||||||
| 値 | Department of Materials Science and Technology, Faculty of Engineering, Iwate University | |||||||
| 登録日 | ||||||||
| 日付 | 2012-01-10 | |||||||
| 書誌情報 |
Physical Review B 巻 63, 号 16, p. 165322-1-165322-20, 発行日 2001-01-01 |
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| ISSN | ||||||||
| 収録物識別子タイプ | ISSN | |||||||
| 収録物識別子 | 1098-0121 | |||||||
| Abstract | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | We investigate the evolution of elementary excitations at a doped polar semiconductor surface in a depletion-layer formation process. The elementary excitations analyzed are two coupled plasmon-phonon modes and a surface optical-phonon mode involving screening charges. Surface excitations of free carriers are calculated by taking account of the Coulomb interaction between carriers, the dynamical exchange-correlation effect, and the coupling with surface polar phonons, on the basis of thermal-equilibrium states calculated self-consistently by the local-density approximation. We focus our attention on the coupling character and the spatial structure of each surface-excitation mode, as well as the energy dispersion and the energy-loss intensity involved in the excitation. The induced charge-density distribution in the excitation mode is composed of a carrier component due to carrier density fluctuation, a phonon component arising from longitudinal polar-phonon polarization, and two on-surface components originating from the termination of the polar phonon and background polarization at the surface. The coupling character is elucidated by the phase relation and the amplitude ratio among these induced charge components. The spatial structure is visualized by the contour map of the induced charge-density distribution. We follow the variation in the coupling character and the spatial structure in the depletion-layer formation process. Our analysis gives a clear explanation of the variation in each of the three loss peaks in the electron energy-loss spectrum. | |||||||
| 出版者 | ||||||||
| 出版者 | American Physical Society | |||||||
| 権利 | ||||||||
| 権利情報 | (c)2001 The American Physical Society | |||||||
| DOI | ||||||||
| 関連タイプ | isIdenticalTo | |||||||
| 識別子タイプ | DOI | |||||||
| 関連識別子 | 10.1103/PhysRevB.63.165322 | |||||||
| 著者版フラグ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
