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.
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Showing 1 to 20 of 24 for “"quasicrystals"”.
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Ultracold atoms for synthetic one-dimensional quasicrystals
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Studies on quasicrystals, superconducting micronetworks, and Josephson junction arrays
This thesis consists of three parts. In the first part, we study electronic and acoustic properties of one dimensional quasi crystals. Several approaches are used to study this system, including: (i) the first direct solution of the Hamiltonian -including a general treatment of the boundary effects …
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Self-Consistent Study of Topological Superconductivity in Two-Dimensional Quasicrystals
In the past several years, there has been a burst of theoretical and experimental activities in the field of topological superconductors. Topological superconductivity (TSC) results in a novel superconducting state characterized by a nonzero topological invariant in the bulk. There is a relation …
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Decagonal quasicrystals in the Al(Si)-Cu-Co alloy system
We have found four different decagonal quasicrystals in the Al65Cu20Co 15 alloy system. They have different periodicities along the tenfold axis, namely, 0.4, 0.8, 1.2 and 1.6nm. This suggests that the decagonal quasicrystal might have a fundamental structure with periodicity of 0.4nm, the other …
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Surface structures of Al-Pd-Mn and Al-Cu-Fe icosahedral quasicrystals
<p>Surface structures of Al-Pd-Mn and Al-Cu-Fe surfaces, prepared and characterized in ultrahigh vacuum (UHV), have been systematically studied by low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM). The set of four surfaces we have investigated, Al-Pd-Mn twofold, …
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Quasicrystalline optical lattices for ultracold atoms
Quasicrystals are long-range ordered and yet non-periodic. This interplay results in a wealth of intriguing physical phenomena, such as the inheritance of topological properties from higher dimensions, self-similarity, and the presence of non-trivial structure on all scales. The concept of …
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Observing the 2D Bose glass in an optical quasicrystal
Quasicrystals are a class of materials that are long-range ordered yet not periodic. These unique features make them a fascinating middle ground between order and disorder, thus providing an ideal platform for studying a wealth of physical phenomena. This thesis contains three experimental works …
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Between order and disorder: ultracold atoms in a quasicrystalline optical lattice
Quasicrystals are long-range ordered and yet non-periodic. This interplay results in a wealth of intriguing physical phenomena, such as self-similarity, the inheritance of topological properties from higher dimensions, and the presence of non-trivial structure on all lengthscales. However, …
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Quantum simulation beyond periodicity: A theoretical study of the many-body and topological properties of quasiperiodic systems
Quasicrystals are intriguing materials that lie at the border between periodic and disordered matter. Their atomic structure exhibits fully long-range ordered, yet never-repeating structures. As such, they inherit properties from both periodic and disordered materials, and are for instance …
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Phase transitions in quasiperiodic and driven optical lattices
… to our knowledge has never been done before. Quasicrystals are a fascinating but still relatively under-explored class of materials existing as an intermediate between periodic and disordered systems. This makes them an ideal context for studying non-ergodic behaviour, especially with the …
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Impact of morphology and scale on the physical properties of periodic/quasiperiodic micro- and nano- structures
… circuits on an optical chip [4], photonic quasicrystals with the most premier photonic properties to date [5], plasmonics [6], and structure-property correlation analysis [7], multiple-exposure interference lithography [8], and the world's first searchable database system for nanostructures …
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Novel applications of Maxwell's equations to quantum and thermal phenomena
… of quasi-periodic structures, termed photonic-quasicrystals (PQCs).
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Phase Formation, Liquid Structure, and Physical Properties of Amorphous- and Quasicrystal-forming Alloys
Since the discovery of quasicrystals in 1985 and the development of commercially viable bulk metallic glasses: BMGs) in the mid 1990's a great deal of attention has been given to the characterization of new alloys with desirable properties, such as larger amorphous casting thickness, higher …
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Double diffraction of quasiperiodic structures and bayesian image reconstruction
… may provide a methodology for identifying quasicrystals with a very large signal-tonoise ratio. We propose a double diffraction scheme to identify one-dimensional quasiperiodic structures with high precision. The scheme uses a set of scatterers to produce a sequence of quasiperiodic pulses …
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Geometry and Topology of Quantum States in Quasicrystalline Systems
… quantum oscillations can occur in electronic quasicrystals. These were previously observed experimentally but lacked a quantitative theory. We show that due to the spiral holonomy in their band structure, for certain chemical potentials, the quantum oscillations are associated to an exotic …
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The role of soil clays and clay-humic complexes in processes controlling colloidal stability and the sorption and degradation of tetracyclines
… swelling and the breakup and formation of quasicrystals (QCs) and how these processes affect flocculation and dispersion of natural soil clay-humic complexes. The results indicate that high Ca 2+, levels enhance the formation of large QCs, which readily flocculate and settle out of …
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The Development of an African Horse Sickness Virus VP7 Quasi-Crystal Vaccine Candidate in N. benthamiana
… vaccine alternative based on plant-produced quasicrystals of the serogroup-specific AHSV structural protein, VP7. AHSV serotype 5 (AHSV-5) VP7 was expressed in Nicotiana benthamiana by means of Agrobacterium-mediated infiltration of plant expression vector pRIC3.0 encoding VP7 and …
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Mocking quantum mechanics: Semiclassical and machine-learning approaches to frustrated magnetism
… report studies on the localisation properties of quasicrystals; namely, the discovery of thermodynamic universality not described by the usual power laws in one-dimensional quasiperiodic models, and of a two-dimensional quasicrystal in which localised and partially extended states coexist without …
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