Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 31 for “"topological defects"”.
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Topological defects in single and multi-layer graphene
… mismatch between two lattices. Dislocations are topological defects that add an extra half-plane of atoms causing a large strain at the core of the dislocation. Dislocations have been studied for both their role in out-of-plane deformation in mono-layer graphene and periodicity in moir ́e …
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Quantum critical matter: Casimir pairing, emergent orders and topological defects
… models of the CDW. Finally, we consider topological defects (skyrmions and merons) in frustrated magnets which are in the vicinity of a phase transition from a collinear to a spiral magnetic state. We show that isolated metastable skyrmions can exist in the absence of an external magnetic …
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The role of topological defects and textures in the kinetics of phase ordering
… order-parameter space, which results in numerous topologically stable objects being generated during the quench, and influencing the properties of the system during the subsequent approach to equilibrium. The results reported are mostly computational in nature. The two systems investigated are (i) …
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The role of topological defects and textures in the kinetics of phase ordering
… order-parameter space, which results in numerous topologically stable objects being generated during the quench, and influencing the properties of the system during the subsequent approach to equilibrium. The results reported are mostly computational in nature. The two systems investigated are (i) …
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Elucidation of Charge Density Wave Stability and Defect Interactions in the Highly-Ordered Structural Transition Metal Dichalcogenide System 1T-TaS2
… and the underlying lattice, including topological defects. Various methods have been used to visualize the CDW supercells, lattice distortion, and domain structure. However, many of these techniques lack atomic resolution, require additional image processing, or complicate the direct …
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The Shape of Soft Matter: Geometry and Defects
… if the membrane’s topology is non-trivial, and topological defects, which typically arise as finite temperature excitations, are forced to exist even in the ground state. Topological defects can play a key role in the selection of the ground state shape. For example, the presence of defects in …
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Ordering of Curving Interfaces
… order plays a central role on these surfaces. Topological defects in an orientation field are an area of intense historical and on-going interest. This work was published in a paper with my coauthor and advisor Mehran Kardar. I show that curvature modifies diffusion and can change the spatial …
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Rational design of polymer networks and bottlebrush block copolymers
… of new polymer gel design and analysis of topological defects. We also introduce block copolymers and the key architectural differences between our branched bottlebrush design for block copolymer and liquid crystal block copolymer materials. Chapter 2: A dual role for 1,2,4,5-tetrazines in …
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Manifestations of Dark Matter and Variations of the Fundamental Constants of Nature in Atoms and Astrophysical Phenomena
… these low-mass bosons may also form topological defects, such as domain walls, strings and monopoles. The interactions of these oscillating fields or topological defects with ordinary matter can produce effects that are linear in the interaction constant g. Possible linear effects of …
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Topology, Symmetry and Mechanics: Deciphering and Controlling information flows in a living cell
… 2, I show that the statistics and dynamics of topological defects embedded in Rho chemical patterns can be drawn an unexpected parallel to classical and quantum turbulent fluids. In Chapter 3, I further demonstrate a Bosonic symmetry between braided topological defects as well as the emergence …
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Towards quantitatively predicting the properties of gels and elastomers
… this thesis investigates the impact of topological defects on the properties of polymer networks. The first part of this thesis focuses on the topology of end-linked networks and the formation of defects.
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Computational approaches to stochastic systems in physics and biology
… exhibit stochastic behavior: quantum fluids with topological defects arising during quenches and forcing, and complex microbial communities living and evolving withing the gastrointestinal tracts of vertebrates. As such, this dissertation is organized into two parts. In Part I, I create a model …
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The electronic structure of the pair-density-wave (PDW) superconductor in the cuprates
… by this state resulting in a richer set of topological defects than that seen in conventional superconductors. Here I study the electronic structure of the topological defects of the PDW state, paying special attention to the half-vortex and its electronic structure that can be detected in …
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Concentrated Gauss Curvature in Shape-Programmed Shells
… encoded in deformation patterns containing topological defects, holes, and seams - all features where Gauss curvature is generically concentrated. Finally we will address the load-bearing and lifting capacity of shape-programmed cones, which have become a classic example, and whose strength …
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Aspects of Quantum Fluctuations under Time-dependent External Influences
… state is spontaneously broken and vortices (topological defects) form.
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Electric multipole moments and higher-order topological phases in crystalline insulators and superconductors
… charge is at the basis of our understanding of topological band theory. We show, by using the Berry phase formulation and generalizations of it, as well as by exact diagonalization of tight-binding models, that crystalline insulators can generate charge and polarization patterns compatible with …
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Applied fractionalization : quantum phases and phase transitions of strongly interacting systems
… also explore topics such as quantum numbers of topological defects and non-abelian phases of matter. Whenever possible, we compare theoretical predictions with experimental and numerical data. We also discuss deconfined quantum criticality in the context of metallic systems where it opens the …
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Approach to equilibrium in systems with continuous symmetries
… whose relaxational dynamics is dominated by topological defects. The general aspects of the problem are discussed in chapter 1. In chapters 2 and 3, we report the results of two and three dimensional simulations of a simple model with non-conserved order parameter and the symmetry of a planar …
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Thermal activation, long-range ordering, and topological frustration of artificial spin ice
… these predictions. Next, we introduce controlled topological defects into our square ASI samples and observe a new, extended frustration effect of the system. When we introduce a dislocation into the lattice, we still see large domains of ground-state order, but, in every sample, a domain wall …
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Large-Scale Atomistic Simulations of Complex and Functional Properties of Ferroic Materials
… are particularly notable for causing topological defects such as FE vortices and negative dielectric responses in superlattices. In this thesis, I employ two large-scale atomistic techniques, the first-principles-based effective Hamiltonian (HEff) method and the linear-scaling …
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