Atomic reconstruction in twisted trilayer van der Waals materials
뒤틀린 삼층 반데르발스 물질 내 원자 재배열
- 주제어 (키워드) 2D vdW materials , twisted trilayer graphene , trilayer TMD , long range interaction , ferroelectricity; 이차원 반데르발스 물질 , 뒤틀린 삼층 그래핀 , 삼중층 TMD , 장거리 상호작용 , 강유전성
- 발행기관 서강대학교 일반대학원
- 지도교수 백현준
- 발행년도 2025
- 학위수여년월 2025. 2
- 학위명 석사
- 학과 및 전공 일반대학원 물리학과
- 실제 URI http://www.dcollection.net/handler/sogang/000000079305
- UCI I804:11029-000000079305
- 본문언어 한국어
- 저작권 서강대학교 논문은 저작권 보호를 받습니다.
목차
Chapter 1: Introduction 12
1.1 Research background 12
1.2 Structural properties of moiré pattern in twisted system 14
1.3 Ferroelectricity in 2D van der Waals materials 17
1.4 Transmission Electron Microscopy 19
1.5.1 Dark field imaging method 20
1.5.2 Measurement of twist angle 22
Chapter 2: Atomic reconstruction in twisted trilayer graphene 26
2.1 Sample fabrication 26
2.2 Moiré of moiré structure in twisted trilayer graphene 31
2.3 Structural analysis of twisted trilayer graphene 34
2.3.1 Identification of stacking order in domains 35
2.3.2 Reverification of stacking order using scanning probe mi-croscopy 39
2.3.3 Burgers vector analysis 42
2.4 Phase transition by small energy contrast in benal vs. rhombo-hedral stacking order 48
2.5 Structural phase diagram 50
Chapter 3: Domain wall interaction in trilayer transition metal dichal-cogenides56
3.1 Operando TEM 56
3.2 Sample fabrication 58
3.3 Polarzation switching process in trilayer TMD 61
3.4 Domain wall interaction between each layer 62
Chapter 4: Conclusions 67
