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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林敏聰(Minn-Tsong Lin) | |
| dc.contributor.author | Ching-Chou Tsai | en |
| dc.contributor.author | 蔡景州 | zh_TW |
| dc.date.accessioned | 2023-03-19T21:10:14Z | - |
| dc.date.copyright | 2022-09-02 | |
| dc.date.issued | 2022 | |
| dc.date.submitted | 2022-08-30 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/83549 | - |
| dc.description.abstract | 介電環境對於二維材料的特性 - 例如激子結合能、激子半徑以及交換作用強度 - 都有很大的影響力；已經有眾多發表文獻利用介電材料來讓二維材料展現具有應用價值的特性。在這篇論文我們建立受控制的介電環境來研究二維材料中，由於電子-電洞交換作用造成的激子去極化現象。所建立的介電環境透過低溫光致發光 (PL) 光譜來確認除了介電性質以外，材料沒有其他明顯的特性轉變。在不同的介電環境下，我們測量圓偏振極化強度 (極化強度) 來觀察其對於極化強度的影響。為了量化介電強度，我們使用了鏡像電荷法 (相容於 Keldysh 位能) 來估計出環境介電常數 (可用於計算交換作用) 以及總介電常數 (可用於計算激子類氫能階)。我們的極化強度實驗結果顯現出和理論預估不同的介電常數關係，且不能直接被兩種常見的模型：交換作用模型 Maialle-Silva-Sham (MSS) 及動量散射模型解釋。我們在最後提出可能的機制來解釋在實驗設置下觀察到的極化強度結果，以及偏離模型預估的冪次關係。 | zh_TW |
| dc.description.abstract | Dielectric environment plays an important role in determining 2D materials?exciton properties, such as binding energy, exciton radius, and exchange interaction. Numerous reports have realized utilization of dielectrics as a tool to manipulate 2D materials for desired characteristics. Here we use controlled dielectric environment to study the depolarization of exciton in exfoliated WSe2 monolayers due to electron-hole exchange interaction. To verify the uncontrolled variations when modifying dielectric environment, low temperature photoluminescence (PL) spectrum is taken to monitor exciton properties throughout the process. Circular polarization is measured to reveal its relation to dielectric environments. For estimation of effective dielectric constant, we use image charge method, compatible with Keldysh potential, giving both environmental and total dielectric contribution for energy level and exchange interaction estimations. Our result shows unexpected depolarization dependence on dielectric strength that cannot be explained by either momentum scattering or exchange interaction from Maialle-Silva-Sham (MSS) mechanism. We give a possible mechanism for the observed polarization and its deviation from theoretical estimations under practical polarized PL setups. | en |
| dc.description.provenance | Made available in DSpace on 2023-03-19T21:10:14Z (GMT). No. of bitstreams: 1 U0001-3008202212131900.pdf: 16245583 bytes, checksum: 057f550c6989fbd6d9cbcfb8997600ff (MD5) Previous issue date: 2022 | en |
| dc.description.tableofcontents | Contents Acknowledgements 摘要 Abstract Contents List of Figures List of Tables Denotation Chapter 1 Introduction and Backgrounds 1.1 Challenges in sample reproducibility 1.2 Challenges in measurement stability Chapter 2 Sample Preparation 2.1 Exfoliation of WSe2 monolayers 2.2 Deposition of SiO2 on top of WSe2 ML 3.1 Photoelastic modulator and its applications on our system 3.2 PL measurement platform 3.3 Circular polarization measurements 3.4 Normalization of measured signal 3.5 VAC and VDC measurements and resulted polarization Chapter 4 ICM: Estimation of Dielectric Strengths εenv and εtotal 4.1 Rytova-Keldysh potential and image charge method (ICM) 4.2 Estimation of εtop for finite thickness SiO2 top layers using ICM 4.3 Estimation of total dielectric constant εtotal Chapter 5 Spectroscopic Results of WSe2 ML in Different Dielectric Environment 5.1 Possible effects from interface transition and accumulative SiO2 thickness change 5.2 PL spectrum of WSe2 monolayer throughout SiO2 accumulation process 5.3 Fitting result of PL spectrum 5.4 Trion prevalence and carrier density n 5.5 Summary for spectroscopic information Chapter 6 Polarization Measurements in Different Dielectric Environment 6.1 Phonon assisted scattering mechanism for exciton depolarization 6.2 Exciton exchange interaction and MSS theory 6.3 Circular polarization Pc measurements 6.4 Possible reason for Pc’s stronger dielectric dependency Chapter 7 Summary References Appendix A — Oral questions and modification suggestions from the committee A.1 Prof. 江文中 A.2 Dr. 張玉明 A.3 Prof. 林敏聰 A.4 Prof. 徐瑋廷 Appendix B — Modification logs after oral defence Appendix C — Copy of oral defence logs | |
| dc.language.iso | en | |
| dc.title | 介電環境對於二硒化鎢單層內的激子及其維谷去極化之影響 | zh_TW |
| dc.title | The Effect of Dielectric Environment on Exciton and its Valley Depolarization in WSe2 Monolayers | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 110-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 張玉明(Yu-Ming Chang) | |
| dc.contributor.oralexamcommittee | 江文中(Wen-Chung Chiang),徐瑋廷(Wei-Ting Hsu) | |
| dc.subject.keyword | 二硒化鎢,二維過渡金屬硫化物,介電環境,激子,單層,二維材料,交換作用, | zh_TW |
| dc.subject.keyword | WSe2,TMDC,Dielectric environment,Exciton,Monolayer,2D material,Exchange interaction,Exchange coupling, | en |
| dc.relation.page | 68 | |
| dc.identifier.doi | 10.6342/NTU202202963 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2022-08-31 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理學研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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