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 6 of 6 for “"model Hamiltonians"”.
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Quantum Mediated Effective Interactions For Spatially Complex Systems
… degrees of freedom. Chapters 2, 3, 4 and 7 solve model Hamiltonians for quantum spins, where the interactions are boson mediated, and the resulting ground states are spatially complex - meaning that they break translational invariance (some states in Chapter 7 also break time reversal invariance). …
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Examining Topological Insulators and Topological Semimetals Using First Principles Calculations
… a topological insulator, Bi2Se3, by using slab models within density functional theory. Two representative, experimentally achieved surfaces are examined, and it is shown that careful consideration of the crystal symmetry is necessary to understand the physics of the surface state Dirac cones at …
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Topological order in the fractional quantum Hall states
… FQH states, where the idea is to try to obtain model wave functions and model Hamiltonians for all possible FQH states and to have a physical way of characterizing their topological order. I will explain recent attempts to do this through the so-called pattern of zeros framework and its relation …
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Self-interaction and charge transfer in organic semiconductors
… systems of that size, approaches that work with model Hamiltonians are typically not accurate enough in predicting many important electronic properties. However, solving the many-particle Schrödinger-equation by employing highly accurate perturbation theory approaches is often numerically too …
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Formulating design rules to predict 2D materials and heterostructures for next-generation electronics
… quantum theory methods, physics-based model Hamiltonian analysis, and high-performance computing, the structure-property relationships of two-dimensional materials, their heterostructures, and their interaction with substrates, have been explored to identify simple design rules for …
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Modern Electronic Structure Theory using Tensor Product States
… configuration interaction (TPSCI), using a few model Hamiltonians and molecular examples. These numerical results show that TPSCI can be used to significantly reduce the number of SCI variables in the variational space, and thus paving a path for extending these deterministic and variational SCI …