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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳永芳(Yang-Fang Chen) | |
dc.contributor.author | Yu-Ren Peng | en |
dc.contributor.author | 彭裕仁 | zh_TW |
dc.date.accessioned | 2021-06-12T18:18:01Z | - |
dc.date.available | 2007-09-03 | |
dc.date.copyright | 2007-09-03 | |
dc.date.issued | 2007 | |
dc.date.submitted | 2007-08-28 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27737 | - |
dc.description.abstract | 在量子力學中,對於一個一維的位能井問題。若入射粒子的能量高於真空能階,則粒子有可能以1 的機率穿透這個位能井。這個現象稱為「穿透共振」。在我們的實驗裡,我們在超高真空的環境下使用掃描穿隧能譜術在不同的金屬基板上鍍上銀薄膜來量測此種現象。我們一共在三種不同的基材上鍍上銀薄膜,分別為 金(111),銅(100)和鈀(111)。其中在銅(100)和鈀(111)上鍍銀的系統有發現到穿透共振的現象,而這個現象在金(111)上並未發現。在發現到穿透共振的系統中,我們觀察到穿透共振隨著厚度相依的現象,並且也檢驗了穿透共振將其後的駐波態推往高能階的現象。而是否會產生穿透共振的現象的機制,和界面的影響與基材的電子結構有相當大的關係。 | zh_TW |
dc.description.abstract | In quantum mechanics, when the free particle, e.g. electron, impinges on a one dimensional quantum well, the particle can penetrate through the well with probability 1 at some specific energy. This quantum phenomenon is called the transmission resonance, and can be observed using scanning tunneling spectroscopy for some thin metal films. We deposit Ag to form films on three different substrates, which are Cu(100), Pd(111), and Au(111), for studying the interface effect on transmission resonance. Our results demonstrate that the transmission resonance appears in the Ag/Cu(100) and Ag/Pd(111) systems but disappears in the Ag/Au(111) system. The mechanisms behind these results are the interface sharpness and the electronic structures of the substrates. The thickness dependence of transmission resonances was observed, and it was also confirmed that transmission resonances push standing wave states behind them to higher energy level. | en |
dc.description.provenance | Made available in DSpace on 2021-06-12T18:18:01Z (GMT). No. of bitstreams: 1 ntu-96-R94222040-1.pdf: 2999671 bytes, checksum: 185b35271d3a43e0544aa1173d3e3018 (MD5) Previous issue date: 2007 | en |
dc.description.tableofcontents | Table of Contents
Acknowledgements Table of Contents Abstract Chapter 1. Introduction 1 Chapter 2. Experimental principles and methods 3 2.1 Principles of scanning tunneling microscopy (STM) 3 2.2 STM operating modes 4 (a) Constant current mode 4 (b) Constant height mode 5 (c) Scanning tunneling spectroscopy (STS) and Local Density of States (LDOS) 6 2.3 Standing Wave State & Transmission Resonance 8 (a)Standing Wave State (SWS) 9 (b) Transmission Resonance (TR) 10 2.4 Thin Film Grow 14 Chapter 3. Experimental Instruments and Procedure 15 3.1 Whole Setup 15 3.2 UHV System 16 3.3 Sample Preparation 18 (a) Sputter system 18 (b) Anneal system 18 3.4 deposition system 19 3.5 Experimental Procedure 20 Chapter 4. Results and Discussion 21 4.1 Overview 21 4.2 Ag/Au(111) system 22 (a) Growth Mode 22 (b) Results 23 (c) Summary 26 4.3 Ag/Pd(111) system 27 (a) Growth mode 27 (b) Results 30 (c) Summary 35 4.4 Ag/Cu(100) system 36 (a) Growth mode 36 (b) Results 38 (c)Summary 44 4.5 Comparison and Discussion 45 (a) Explanation of more TR in the Ag/Cu(100) system than in the Ag/Pd(111) system 46 (b) Transmission resonances won’t disappear with increasing film thickness 47 (c) Theoretical calculation of transmission resonances 50 4.6 Conclusion 53 List of Figures Captions Chapter 2. Fig. 2.1.1 schema of the wave function and the potential barrier 3 Fig. 2.2.1 schema of the constant current mode of STM 5 Fig. 2.2.2 schema of the constant height mode of STM 5 Fig. 2.2.3 scheme of I-V and Z-V spectroscopy 7 Fig. 2.3.1 schema of SWS & TR 8 Fig. 2.3.2 the finite square well 10 Fig. 2.4.1 schema of growth mode 14 Chapter 3. Fig. 3.1.1 whole setup 15 Fig. 3.4.1 schema showing the structure of an electron-beam gun 19 Fig. 3.5.1 flow chart of our experiments 20 Chapter 4. Fig. 4.2.1 reconstruction of Au(111) 22 Fig. 4.2.2 (a) pure Au and 1ML Ag film, topography and its spectra 24 Fig. 4.2.2 (b) Ag films on Au(111) at the coverage of 10ML, topography and its spectra 24 Fig. 4.2.3 (a) photoemission spectra 25 Fig. 4.2.3 (b) band mismatch of Ag and Au 25 Fig. 4.3.1 (a) Pd with carbon(100nmx100nm) 27 Fig. 4.3.1 (b) Pd surface after oxygen exposure 27 Fig. 4.3.2 (a) 2ML of Ag on Pd(111) 28 Fig. 4.3.2 (b) schematic of the growth mode 28 Fig. 4.3.3 submonolayer of Ag on Pd(111) 29 Fig. 4.3.4 5ML of Ag on Pd(111) 29 Fig. 4.3.5 Möire pattern of Ag on Pd 29 Fig. 4.3.6 (a) topography and its mapping at 6.66V 30 Fig. 4.3.6 (b) spectra of fig 4.3.6(a) 30 Fig. 4.3.7 (a) Ag on Pd (111) from 3ML to 7ML,topography and its corresponding spectra 31 Fig. 4.3.8 trends of TR from 2~7ML ( Ag on Pd(111) ) 32 Fig. 4.3.9 (a) submonolayer of Ag on Pd(111) 33 Fig. 4.3.9 (b) Z-V spectra of 1ML Ag film 33 Fig. 4.3.10 stacking fault of Ag on Pd(111) 34 Fig. 4.4.1 schema of Ag growth on Cu(100) 36 Fig. 4.4.2 (a) topography of c(10x2) and second Ag layers 37 Fig. 4.4.2 (b) island growth of Ag on Cu(100) 37 Fig. 4.4.3 (a) topography of 1~3ML silver film 38 Fig. 4.4.3 (b) spectra of fig4.4.3(a) 38 Fig. 4.4.4 (a) topography of c(10x2), second and fourth layers 39 Fig. 4.4.4 (b) dZ/dV spectra of fig4.4.4(a) 39 Fig. 4.4.5 (a) topography of 5, 6 and 7ML 40 Fig. 4.4.5 (b) spectra of fig 4.4.5(a) 40 Fig. 4.3.6 transmission resonance of Ag on Cu(100) from c(10x2) to 7ML 41 Fig. 4.4.7 (a) topography of Ag on Cu(100),two different layers 42 Fig. 4.4.7 (b) spectra of fig 4.4.6(a) 42 Fig. 4.4.8 (a) topography of 7 different silver layers 43 Fig. 4.4.8 (b) spectra of fig 4.4.7(a) 43 Fig. 4.5.1 scheme of effective quantum well width 46 Fig. 4.5.2 (a) transmission resonances analysis of Ag on Cu(100) 49 Fig. 4.5.2 (b) transmission resonances analysis of Ag on Pd(111) 49 Fig. 4.5.2 (c) transmission resonance analysis of Ag on Si(111)-7x7 49 Fig. 4.5.3 (a) calculation and experiments’ results of Ag/Pd(111) 51 Fig. 4.5.3 (b) calculation and experiments’ results of Ag/Cu(100) 52 Reference | |
dc.language.iso | zh-TW | |
dc.title | 利用掃描穿隧能譜術研究界面對穿透共振的影響 | zh_TW |
dc.title | Interface Effect On Transmission Resonance
In Scanning Tunneling Spectroscopy | en |
dc.type | Thesis | |
dc.date.schoolyear | 95-2 | |
dc.description.degree | 碩士 | |
dc.contributor.coadvisor | 張嘉升(Chia-Seng Chang) | |
dc.contributor.oralexamcommittee | 蘇維彬(Wei-Bin Su) | |
dc.subject.keyword | 超高真空,掃描穿隧能譜術,穿透共振,駐波態,銀薄膜,厚度,相依的量,子現象, | zh_TW |
dc.subject.keyword | ultra high vacuum (UHV),scanning tunneling spectroscopy (STS),transmission resonance (TR),standing wave state (SWS),Ag thin film,thickness dependence of transmission resonance, | en |
dc.relation.page | 53 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2007-08-28 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 物理研究所 | zh_TW |
顯示於系所單位: | 物理學系 |
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