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研究生: 楊謹綱
Yang, Chin-Kang
論文名稱: 使用掃描穿遂顯微鏡探測在原子解析度下表面能態和塊材能態的耦合強度
Probing the surface state to bulk state coupling strength with atomic resolution by scanning tunneling microscope
指導教授: 齊正中
Chi, Cheng-Chung
口試委員:
學位類別: 博士
Doctor
系所名稱: 理學院 - 物理學系
Department of Physics
論文出版年: 2010
畢業學年度: 98
語文別: 英文
論文頁數: 112
中文關鍵詞: 掃描式穿遂電子顯微鏡表面能態塊材能態表面跟塊材間的耦合強度矽(111) 7x7 重構表面
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  • 自從Binning發明了掃描式穿遂顯微鏡以後,它就變成了研究原子尺度下樣品表面能態及樣品塊材能態的有利工具。許多研究者使用這個工具以及它特有的能力來研究表面原子的排列及電子的能態密度。雖然有大量的研究成果被發表,但是很少有人使用這一工具來探索原子尺度下表面和塊材之間耦合強度的特性。在論文中,我們便使用它來研究在矽(111) - 7 ´ 7重構表面上的這個特性。當我們量測表面形貌及能態譜圖時,我們慢慢地讓針靠近樣品。其結果顯示當針相當靠近樣品時,表面形貌的對稱性被破壞了。而且能態譜圖也從原本的金屬性表面能態密度變成帶有能隙的矽塊材能態密度。實驗的結果表明,出現這種現象的原因不僅僅只是來自於針和樣品表面。為了解釋這樣的現象,我們發展了一個模型。在這個模型中,穿遂電流大小的改變會改變針跟表面能態之間的耦合強度及表面跟塊材能態之間的耦合強度,進而使表面能態的化學勢產生變化。計算得出的結果和實驗結果相當吻合。因此,根據我們的模型,在針相當接近樣品表面時,塊材能態對穿遂電流的貢獻越大。在4.3K的溫度下,塊材能態成為最主要的貢獻,因此我們在這個條件下其實看到了塊材的能態。論文中的實驗及理論模型也提供了一個研究塊材能態及表面和塊材間耦合強度的新方法。


    Chapter 1: Introduction to background, scanning tunneling microscope, and Si (111) - 7 × 7 reconstructed surface 1.1 Introduction to background and motivation 1 1.2 Introduction to Scanning Tunneling Microscope 4 1.3 Introduction to Si(111) 7 × 7 reconstructed surface 9 1.4 Outline of this thesis 13 Chapter 2: Experimental setup, sample preparation and tip treatment 2.1 Low temperature ultra-high-vacuum scanning tunneling microscopy system 14 2.2 Si(111) 7 × 7 reconstructed surface preparation 21 2.3 Tip treatment 25 2.4 The whole process of measurement 28 Chapter 3: Experimental results 3.1 Si (111) - 7 × 7 reconstructed surface topographic image at different temperature and different tunneling current 29 3.2 (dI/dV)/(I/V)average spectra taken at 4.3K and 20K 35 3.3 The I(z) curves taken at 4.3K 52 3.4 Summary and Implication 55 Chapter 4: Calculation model and fitting results 4.1 The model 56 4.2 The derivation of our calculation equations 58 4.3 The method of finding fitting parameters 62 4.4 The fitting results and analyses 64 Chapter 5: Conclusion 108 References 110

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