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  1. NTU Theses and Dissertations Repository
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請用此 Handle URI 來引用此文件: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/89601
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dc.contributor.advisor梁啟德zh_TW
dc.contributor.advisorChi-Te Liangen
dc.contributor.author蔡鵬穎zh_TW
dc.contributor.authorPeng-Ying Tsaien
dc.date.accessioned2023-09-11T16:26:49Z-
dc.date.available2025-08-01-
dc.date.copyright2023-09-11-
dc.date.issued2023-
dc.date.submitted2023-07-13-
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dc.identifier.urihttp://tdr.lib.ntu.edu.tw/jspui/handle/123456789/89601-
dc.description.abstract本論文主要探討在矽基板上成長的砷化鎘薄膜之磁傳輸行為。當外加垂直於平面的磁場時,線性正磁阻現象被觀察到,而當外加平行電流方向的磁場時,則會產生負磁阻行為,並且可以歸因於手性異常效應,藉此證實三維狄拉克半金屬在外加磁場時,會因為時間反演對稱性被破壞而轉變為具有外爾半金屬相。除此之外,在垂直和平行磁場中都可以觀察到弱侷域化效應,並根據相位相干長度的溫度依賴性,我們推測在系統中的量子擴散傳輸行為是由電子-電子交互作用所主導。zh_TW
dc.description.abstractIn this thesis, the magnetotransport behavior of a Cd3As2 film grown on Si substrate with a ZnTe buffer layer has been discussed. Positive linear magnetoresistance appears in the presence of the perpendicular magnetic field, and negative magnetoresistance under a parallel magnetic field has been observed, which is attributed to the chiral anomaly effect. The appearance of the chiral anomaly effect provides evidence of the realization of the Weyl semimetal phase in 3D Dirac semimetal caused by time-reversal symmetry breaking. Besides, the weak antilocalization effect can be observed in both perpendicular and parallel magnetic fields. Based on the temperature dependence of phase coherence length, we concluded that the electron-electron interaction dominates the quantum diffusive transport in the system.en
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dc.description.tableofcontents口試委員會審定書 ii
致謝 iii
中文摘要 iv
ABSTRACT v
Contents vi
List of Figures vii
Chapter 1 Introduction 1
Chapter 2 Theoretical Background and Literature Review 5
2.1 Dirac and Weyl semimetal 5
2.2 Cadmium arsenide (Cd3As2) 8
2.2.1 Band structure of Cd3As2 8
2.2.2 Angular dependence of transport properties in Cd3As2 11
2.2.3 Thickness dependence of properties in Cd3As2 films 12
2.3 Weak antilocalization effect 14
2.4 Chiral anomaly effect 17
Chapter 3 Fabrication and Measurement Techniques 26
3.1  Molecular beam epitaxy and RHEED 26
3.2 Fabrication of Cd3As2 device 28
3.3 Measurement techniques 32
Chapter 4 Results and Discussion 36
4.1 Magnetotransport under a perpendicular magnetic field (B∥c) 37
4.2 Magnetotransport under a parallel magnetic field (B∥a) 49
Chapter 5 Conclusion 59
-
dc.language.isoen-
dc.subject弱侷域化效應zh_TW
dc.subject砷化鎘zh_TW
dc.subject三維狄拉克半金屬zh_TW
dc.subject外爾半金屬zh_TW
dc.subject手性異常效應zh_TW
dc.subject3D Dirac semimetalen
dc.subjectCd3As2en
dc.subjectweak antilocalizationen
dc.subjectchiral anomalyen
dc.subjectWeyl semimetalen
dc.title矽基板上成長的砷化鎘薄膜之磁傳輸zh_TW
dc.titleMagnetotransport in Cd3As2 films grown on Sien
dc.typeThesis-
dc.date.schoolyear111-2-
dc.description.degree碩士-
dc.contributor.oralexamcommittee蔡宗惠;莊家翔zh_TW
dc.contributor.oralexamcommitteeTsung-Hui Tsai;Chia-Shain Chuangen
dc.subject.keyword砷化鎘,三維狄拉克半金屬,外爾半金屬,手性異常效應,弱侷域化效應,zh_TW
dc.subject.keywordCd3As2,3D Dirac semimetal,Weyl semimetal,chiral anomaly,weak antilocalization,en
dc.relation.page59-
dc.identifier.doi10.6342/NTU202301395-
dc.rights.note未授權-
dc.date.accepted2023-07-13-
dc.contributor.author-college理學院-
dc.contributor.author-dept物理學系-
顯示於系所單位:物理學系

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