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このアイテムの引用には次の識別子を使用してください:
http://hdl.handle.net/10119/4517
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| タイトル: | Optical absorption of semiconducting and metallic nanospheres with the confined electron-phonon coupling |
| 著者: | J. D. Lee |
| 発行日: | 2006-03-16 |
| 出版者: | American Institute of Physics |
| 誌名: | Journal of Chemical Physics |
| 巻: | 124 |
| 号: | 19 |
| 開始ページ: | 194706-1 |
| 終了ページ: | 194706-11 |
| DOI: | 10.1063/1.2199851 |
| 抄録: | We study the optical absorption, especially the (far-) infrared absorption by phonons, of semiconducting and metallic nanospheres. In the nanoscopic sphere, phonons as well as states of electronic excitations are quantized by confinement. It is also known that in the nanoscopic geometry, the confined electron-phonon interaction has a different form from the usual one in the bulk. First, we analyze the phonon and electron contributions to the dielectric response of nanospheres like ε(q,ω)=ε_<ph>(q,ω)+ε_<el>(q,ω) or 1/ε(q,ω)=1/ε_<sc-ph>(q,ω)+1/ε_<el>(q,ω) from the confined electron-phonon interaction for three cases: the intrinsic semiconductor, the doped semiconductor, and the metal. From the dielectric response, the optical absorption spectra are calculated within the semiclassical framework concentrating on the (far-) infrared region and compared to the spectra without imposing confinement. Nontrivial differences of the spectra with confined phonons stem from two features: the electron-phonon coupling matrix has a different form and the phase space q of the confined phonon is reduced because of its quantization to q_n. Finally, size distribution effects in an ensemble of isolated nanospheres are briefly discussed. Those effects are found to be important in metallic spheres with rapid sweepings of resonances by a small change of the sphere size. |
| Rights: | Copyright 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J.D. Lee, Journal of Chemical Physics, 124(19), 194706 (2006) and may be found at http://link.aip.org/link/?JCPSA6/124/194706/1 |
| URI: | http://hdl.handle.net/10119/4517 |
| 資料タイプ: | publisher |
| 出現コレクション: | c10-1. 雑誌掲載論文 (Journal Articles)
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