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Understanding and Controlling the Magnetic and Optical Properties in Van der Waals Semiconductors
Understanding and Controlling the Magnetic and Optical Properties in Van der Waals Semiconductors
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152804
- ISBN
- 9798384093824
- DDC
- 530
- 저자명
- Xie, Kaichen.
- 서명/저자
- Understanding and Controlling the Magnetic and Optical Properties in Van der Waals Semiconductors
- 발행사항
- [Sl] : University of Washington, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 92 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Cao, Ting.
- 학위논문주기
- Thesis (Ph.D.)--University of Washington, 2024.
- 초록/해제
- 요약Within the broad spectrum of two-dimensional (2D) materials, 2D van der Waals (vdW) magnetic semiconductors are distinguished by their novel properties, which stem from the weak yet tunable interlayer magnetic interactions, adding an entirely new magnetic degree of freedom to vdW interfacial engineering. In this dissertation, we discuss the understanding and prediction of the magnetic and optical properties of vdW magnetic semiconductors employing ab initio methods alongside other theoretical and computational techniques. This dissertation is organized as follows:In Chapter 1, we provide a brief introduction to the theoretical and computational methods that compute the quasiparticle and exciton properties of materials, and the recent advancements in the field of 2D magnetic semiconductors.In Chapter 2, we focus on exploring the magneto-excitonic coupling in a prototypical 2D vdW magnet CrSBr utilizing ab initio calculations. We uncover the anisotropic Wannier nature of the 2D excitons in few-layer CrSBr and the entanglement of excitons between vdW layers of this material.In Chapter 3, we present several mechanical approaches to harnessing the power of magneto-electronic coupling in 2D vdW magnet CrSBr. Our qualitative analysis attributes the effects of these mechanical tuning knobs on magnetic properties to subtle alterations in bond geometry.In Chapter 4, we investigate the intriguing potential for manipulating magnetic phases in 2D magnets through interfacial charge transfer in heterostructures of magnetic and nonmagnetic layers.4 We unveil a transition towards the ferromagnetic phase by stacking antiferromagnetic bilayer CrSBr on graphene and by electrostatic doping. We further demonstrate that the phase transition is a spin-canting process.In Chapter 5, we establish a theoretical framework to investigate the ultrafast optical control of excitonic structures. We demonstrate coherent optical field as a powerful tool to manipulate the excitonic properties in 2D materials. From our calculations, we find that the dark and bright excitons can be coherently coupled, resulting in novel absorption features as a function of frequency.
- 일반주제명
- Condensed matter physics
- 일반주제명
- Materials science
- 일반주제명
- Electromagnetics
- 일반주제명
- Physical chemistry
- 기타저자
- University of Washington Materials Science and Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017163872
■00520250211152804
■006m o d
■007cr#unu||||||||
■020 ▼a9798384093824
■035 ▼a(MiAaPQ)AAI31556908
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aXie, Kaichen.
■24510▼aUnderstanding and Controlling the Magnetic and Optical Properties in Van der Waals Semiconductors
■260 ▼a[Sl]▼bUniversity of Washington▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a92 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Cao, Ting.
■5021 ▼aThesis (Ph.D.)--University of Washington, 2024.
■520 ▼aWithin the broad spectrum of two-dimensional (2D) materials, 2D van der Waals (vdW) magnetic semiconductors are distinguished by their novel properties, which stem from the weak yet tunable interlayer magnetic interactions, adding an entirely new magnetic degree of freedom to vdW interfacial engineering. In this dissertation, we discuss the understanding and prediction of the magnetic and optical properties of vdW magnetic semiconductors employing ab initio methods alongside other theoretical and computational techniques. This dissertation is organized as follows:In Chapter 1, we provide a brief introduction to the theoretical and computational methods that compute the quasiparticle and exciton properties of materials, and the recent advancements in the field of 2D magnetic semiconductors.In Chapter 2, we focus on exploring the magneto-excitonic coupling in a prototypical 2D vdW magnet CrSBr utilizing ab initio calculations. We uncover the anisotropic Wannier nature of the 2D excitons in few-layer CrSBr and the entanglement of excitons between vdW layers of this material.In Chapter 3, we present several mechanical approaches to harnessing the power of magneto-electronic coupling in 2D vdW magnet CrSBr. Our qualitative analysis attributes the effects of these mechanical tuning knobs on magnetic properties to subtle alterations in bond geometry.In Chapter 4, we investigate the intriguing potential for manipulating magnetic phases in 2D magnets through interfacial charge transfer in heterostructures of magnetic and nonmagnetic layers.4 We unveil a transition towards the ferromagnetic phase by stacking antiferromagnetic bilayer CrSBr on graphene and by electrostatic doping. We further demonstrate that the phase transition is a spin-canting process.In Chapter 5, we establish a theoretical framework to investigate the ultrafast optical control of excitonic structures. We demonstrate coherent optical field as a powerful tool to manipulate the excitonic properties in 2D materials. From our calculations, we find that the dark and bright excitons can be coherently coupled, resulting in novel absorption features as a function of frequency.
■590 ▼aSchool code: 0250.
■650 4▼aCondensed matter physics
■650 4▼aMaterials science
■650 4▼aElectromagnetics
■650 4▼aPhysical chemistry
■653 ▼aTwo-dimensional materials
■653 ▼aMagnetic semiconductors
■653 ▼aExcitonic structures
■653 ▼aMagneto-electronic coupling
■653 ▼aGraphene heterostructure
■690 ▼a0794
■690 ▼a0611
■690 ▼a0607
■690 ▼a0494
■71020▼aUniversity of Washington▼bMaterials Science and Engineering.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0250
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163872▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


