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 10 of 10 for “"geometric phases"”.
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Experimental Observation of Geometric Phases in Narrow-Gap Semiconductor Heterostructures
… enable observation of delicate quantum phases; and the strong spin-orbit interaction (SOI) in the systems gives us means by which we can manipulate the quantum-mechanical spin of these electrons through the orbital properties of the electrons. This enables the observation of …
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Quantum information processing with geometric phases, cavity magnonics, and semiconductor nanostructures
… Zeeman interactions by a process reminiscent of geometric phases.
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Stoner magnetism and Berry phase in quantum materials
… arising in this way on the correlated electron phases. The effect of Berry phase is particularly interesting for magnetic phases with spin and valley polarization originating from Stoner instability, such as those seen in moiré graphene and other narrow-band systems. Despite recent advances in …
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A Study on Heterotic Target Space Duality – Bundle Stability/Holomorphy, F-theory and LG Spectra
… of target space duality (TSD) originates in non-geometric phases and can be used to generate distinct GLSMs with shared geometric phases leading to apparently identical target space theories. To date, this duality has largely been studied at the level of counting states in the effective theories. …
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Studies of Small Systems in Quantum Information
… allows for the calculation of path-dependent phases called geometric phases. These geometric phases are central to understanding a variety of experiments. I present a general technique, called unitary integration to handle operator equations and employ it to study various physical systems in …
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Topological Signatures for the Kitaev Chain in and out of Equilibrium
… to signal transitions between distinct gapped phases. A complementary perspective is also developed, based on non-local order parameters calculated using Toeplitz determinant techniques, providing an analytic expression for a proposed nonlocal topological order parameter. We also investigate …
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Defects, topology, and the geometric phase in condensed matter physics
… in condensed matter physics, particularly geometric phases and defects. The first chapter deals with pentagonal disclinations in graphene and their associated bound states. This problem had been attacked previously, using index theorems, as well as the solutions of the continuum Dirac …
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Studies on the effect of noise in boundary quantum phase transitions
… the other hand, different from the geometrical confinement of boundaries, dissipation or quantum noise widely exists along the entire system.</p><p>In bulk quantum phase transitions, dissipation decreases system coherence by reducing the long-range correlations.</p><p>This fact makes …
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Mesoscopic wave phenomena in electronic and optical ring structures
Gegenstand dieser Arbeit sind Wellenphänomene in mesoskopischen Ringstrukturen. In Teil I der Arbeit befassen wir uns mit spinabhängigem Transport von Elektronen in effektiv eindimensionalen Ringen in Gegenwart inhomogener Magnetfelder. Wir benutzen die exakten Lösungen der Schrödinger-Gleichung im …