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Symmetry-Driven Phenomena in Complex Media
Symmetry-Driven Phenomena in Complex Media
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105220
- ISBN
- 9798291566084
- DDC
- 530
- 저자명
- Cheng, Nan.
- 서명/저자
- Symmetry-Driven Phenomena in Complex Media
- 발행사항
- [Sl] : University of Michigan, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 155 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Mao, Xiaoming.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2025.
- 초록/해제
- 요약Physical laws are fundamentally governed by underlying symmetries, resulting in distinct behaviors across systems characterized by different symmetry groups. Recent advances in experimental techniques have enabled the synthesis of complex media exhibiting novel symmetries, necessitating a systematic exploration of the consequences arising from these symmetries. This thesis investigates the profound impacts of novel symmetry structures on band structure, ground-state configurations, spectrum, and dynamic behaviors of physical systems through four representative studies.In the first study, we examine lattice symmetries in hyperbolic spaces and their implications for band structures. Due to the intrinsic negative curvature of hyperbolic geometry, translation groups in such spaces become inherently non-Abelian, invalidating conventional band theory that typically neglects higher-dimensional representations. We generalize the Euclidean Bravais lattice concept to hyperbolic space utilizing group-theoretic methods and subsequently formulate a hyperbolic Bloch theorem via group Fourier analysis. This framework elucidates anomalous mode-counting behaviors, unusual degeneracies, and novel bulk-edge correspondences distinctive to hyperbolic lattices.The second study explores the role of symmetry in the self-assembly of icosahedral nanoparticles. The intrinsic five-fold rotational symmetry of icosahedra precludes their arrangement into periodic lattices in Euclidean three-dimensional space, causing inevitable geometric frustration and prestress during assembly. We identify that the incompatibility encountered in Euclidean space is resolved within three-dimensional hyperbolic geometry, where icosahedra form a non-Euclidean crystal structure denoted as the lattice. By analytically modeling elastic and repulsive interactions, we characterize the prestressed morphologies resulting from the self-assembly process and identify a cluster-size-driven morphological transition that spontaneously breaks rotational symmetry.In the third investigation, we uncover an emergent conformal symmetry in two-dimensional isotropic elastic media as the bulk-to-shear modulus ratio approaches zero. Leveraging this emergent symmetry, we propose a novel class of passive, linear, one-way edge states arising from spin-momentum locking of Rayleigh waves. These edge states demonstrate perfect unidirectional and robust propagation, immune to edge roughness and unrestricted by traditional bulk-band gaps. We further demonstrate the topological nature of these edge states through a winding number that preserves linear momentum, highlighting potential applications in phononic devices capable of operation across previously inaccessible frequency ranges.The final study addresses the influence of translational symmetry on spectral properties in non-Hermitian systems. While non-Hermitian spectra are typically sensitively to boundary conditions, translational symmetry ensures that spectral moments remain invariant. Exploiting this invariance, we introduce a novel criterion for classifying bulk dynamical phases based on experimentally accessible observables. This criterion applies universally across dimensions and boundary conditions, facilitating the identification of a new type of bulk dispersive-to-proliferative phase transition, distinct from and contrary to conventional real-to-complex spectral transitions.Collectively, these studies advance our understanding of the profound consequences novel symmetries have on physical systems, offering new theoretical insights and avenues for technological applications.
- 일반주제명
- Physics
- 일반주제명
- Applied mathematics
- 일반주제명
- Condensed matter physics
- 일반주제명
- Optics
- 키워드
- Symmetry
- 키워드
- Self assembly
- 기타저자
- University of Michigan Physics
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105220
■006m o d
■007cr#unu||||||||
■020 ▼a9798291566084
■035 ▼a(MiAaPQ)AAI32271796
■035 ▼a(MiAaPQ)umichrackham006417
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aCheng, Nan.
■24510▼aSymmetry-Driven Phenomena in Complex Media
■260 ▼a[Sl]▼bUniversity of Michigan▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a155 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Mao, Xiaoming.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2025.
■520 ▼aPhysical laws are fundamentally governed by underlying symmetries, resulting in distinct behaviors across systems characterized by different symmetry groups. Recent advances in experimental techniques have enabled the synthesis of complex media exhibiting novel symmetries, necessitating a systematic exploration of the consequences arising from these symmetries. This thesis investigates the profound impacts of novel symmetry structures on band structure, ground-state configurations, spectrum, and dynamic behaviors of physical systems through four representative studies.In the first study, we examine lattice symmetries in hyperbolic spaces and their implications for band structures. Due to the intrinsic negative curvature of hyperbolic geometry, translation groups in such spaces become inherently non-Abelian, invalidating conventional band theory that typically neglects higher-dimensional representations. We generalize the Euclidean Bravais lattice concept to hyperbolic space utilizing group-theoretic methods and subsequently formulate a hyperbolic Bloch theorem via group Fourier analysis. This framework elucidates anomalous mode-counting behaviors, unusual degeneracies, and novel bulk-edge correspondences distinctive to hyperbolic lattices.The second study explores the role of symmetry in the self-assembly of icosahedral nanoparticles. The intrinsic five-fold rotational symmetry of icosahedra precludes their arrangement into periodic lattices in Euclidean three-dimensional space, causing inevitable geometric frustration and prestress during assembly. We identify that the incompatibility encountered in Euclidean space is resolved within three-dimensional hyperbolic geometry, where icosahedra form a non-Euclidean crystal structure denoted as the lattice. By analytically modeling elastic and repulsive interactions, we characterize the prestressed morphologies resulting from the self-assembly process and identify a cluster-size-driven morphological transition that spontaneously breaks rotational symmetry.In the third investigation, we uncover an emergent conformal symmetry in two-dimensional isotropic elastic media as the bulk-to-shear modulus ratio approaches zero. Leveraging this emergent symmetry, we propose a novel class of passive, linear, one-way edge states arising from spin-momentum locking of Rayleigh waves. These edge states demonstrate perfect unidirectional and robust propagation, immune to edge roughness and unrestricted by traditional bulk-band gaps. We further demonstrate the topological nature of these edge states through a winding number that preserves linear momentum, highlighting potential applications in phononic devices capable of operation across previously inaccessible frequency ranges.The final study addresses the influence of translational symmetry on spectral properties in non-Hermitian systems. While non-Hermitian spectra are typically sensitively to boundary conditions, translational symmetry ensures that spectral moments remain invariant. Exploiting this invariance, we introduce a novel criterion for classifying bulk dynamical phases based on experimentally accessible observables. This criterion applies universally across dimensions and boundary conditions, facilitating the identification of a new type of bulk dispersive-to-proliferative phase transition, distinct from and contrary to conventional real-to-complex spectral transitions.Collectively, these studies advance our understanding of the profound consequences novel symmetries have on physical systems, offering new theoretical insights and avenues for technological applications.
■590 ▼aSchool code: 0127.
■650 4▼aPhysics
■650 4▼aApplied mathematics
■650 4▼aCondensed matter physics
■650 4▼aOptics
■653 ▼aSymmetry
■653 ▼aHyperbolic lattice
■653 ▼aSelf assembly
■653 ▼aAuxetic materials
■653 ▼aNon-Hermitian physics
■690 ▼a0605
■690 ▼a0752
■690 ▼a0611
■690 ▼a0364
■71020▼aUniversity of Michigan▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359822▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


