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  • 學位論文

利用角解析光電子能譜及低能量電子繞射研究鉛(100)薄膜在鍺(100)基底上之電子結構與薄膜性質

Study of the electronic structure and thin film properties of Pb(100) on Ge(100) by Angle-Resolved Photoemission(ARPES) and LEED

指導教授 : 唐述中

摘要


我們利用金原子在鍺(100)基底上形成的c(8x2)結構當作緩衝層,成功地在零下150℃製備原子平坦的鉛(100)薄膜;並利用角解析光電能譜術測量了鉛(100)薄膜量子井態的能帶結構。位在鉛(100)薄膜Γ ¯位置的量子井態能量與厚度的關係可以利Bohr-Sommerfeld量子化規則來計算。此外,我們還發現了鉛(100)的薄膜在升溫至室溫後,會形成兩個領域同時存在的六角形結構,並且此結構是鉛(111)面結構的兩倍大。量測此特殊六角型鉛結構的能帶結構,我們發現在表面布里淵區的邊界上能帶有著分裂的現象。

並列摘要


We successfully grow the Pb(100) thin films on the substrate of Ge(100) by using Au/Ge(100)-c(2x8) reconstructed surface as a template at T=-150℃. Through the thickness dependence of quantum-well-state energies measured by photoemission spec- troscopy, we found the Pb(100) thin film grow layer-by-layer. By checking the Low Energy Electron Diffraction (LEED) pattern, we observed that the square structure of Pb(100) thin film trans- forms to a hexagonal structure after being annealed to room temperature, but the size of the special hexagonal lattice was different from that Pb(111) films.

並列關鍵字

Pb(100) thin film ARPES LEED Quantum well state

參考文獻


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