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 144 for “"ground-states"”.
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Ground states in artificial spin ice
… to place artificial spin ice samples into their ground state, which previously-used techniques such as ac demagnetization were unable to do. Second, the shakti lattice, a new lattice geometry that better mimics the behavior of real spin ice, is described. Third, a series of experiments using …
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Novel ground states of Bose-condensed gases
Bose-Einstein condensates (BEC) provide a novel tool for the study of macroscopic quantum phenomena and condensed matter systems. Two of the recent frontiers, quantized vortices and ultracold molecules, are the subject of this thesis. The formation of highly-ordered vortex lattices in a …
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Calculation of nondifferential properties for atomic ground states /
… for sampling the exact (within the nodal error) ground state distribution and nondiflPerential properties of multielectron systems is developed and applied to firstrow atoms. Calculated properties are the distribution moments and the electronic density at the nucleus (the 6 operator). For this …
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Spectral problems on triangles and disks: Extremizers and ground states
… upon the shape of the domain, and identify the ground state energy level of the magnetic Laplacian on the disk. Although we consider these different questions we can find some kind of unity in the sense that we are looking at the eigenvalues (energy levels) of the operator. In the first case, …
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Asymptotic Stability of the Ground States of the Nonlinear Schrodinger Equation
… the asymptotic stability of the nonlinear bound states, i.e. periodic in time localized in space solutions. Our result shows that all solutions with small initial data, converge to a nonlinear bound state. Therefore, the nonlinear bound states are asymptotically stable. The proof hinges on …
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Ground states of a two-dimensional frustrated quantum antiferromagent Cs₂CuCl₄
… as one of the candidates for materials with ground state spin liquid phase. The recent experimental results show that there exist several ground state phases in the presence of magnetic field which cannot be explained with classical Hamiltonian. In the thesis, I numerically studied the ground …
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Interplay between FQH Ground States, Regular Graphs, Binary Invariants, and [formula] -Algebras
… example of topologically ordered matter. The ground state’s delicate structure, conjointly with anyonic statistics of local excitations, are two of the intriguing, if not defining, features of these phases. For the eventual goal of classifying topologically ordered matter, a better …
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Ground States through Variational Optimization using Matrix Product States: a comparison between open and periodic boundary conditions
Matrixproduktzustände können Grundzustände effizient approximieren. Basierend auf dem Matrix-Produkt-Formalismus verwenden wir Methoden der Variationsoptimierung zur Berechnung der Grundzustandsenergien des kritischen Spin-1/2 Heisenberg- und des transversalen Spin-1/2 Ising-Modells in einer …
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Various Manifestation of Non -Abelian Statistics in Condensed Matter Systems
Since fractional statistics of Laughlin states is reflected in its topological degeneracy, it is natural to expect non-Abelian statistics to have some effect on topological degeneracy. To study the topological degeneracy of the Moore-Read nu = 5/2 quantum Hall state on a torus, we construct the …
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Green's function Monte Carlo calculations of few-nucleon systems
… interactions. Our approach for modeling the ground states of nuclear systems begins with the development of a variational wave function. We discuss the basis for our variational wave functions and the Monte Carlo techniques used to evaluate expectation values with these wave functions. To …
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Quantum Mediated Effective Interactions For Spatially Complex Systems
… lattice and one can ask about the nature of the ground state resulting from minimizing the magnetic interactions. More often than not, a ground state, defined by specifying the spin orientation or the spin state at every site on the discrete lattice, is complex. Complex meaning that the spin …
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Bifurcations in nonlinear Schrödinger equations with double well potentials
… We discuss bifurcations along bound states, especially ground states and the first excited states, and also deal with orbital stability of the ground states. In attractive case with large separations for double wells, our results shows that the ground state must undergo the secondary …
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Eigenvalues and low energy eigenvectors of quantum many-body systems
… an overview of the thesis and Matrix Product States (MPS) representation of quantum spin systems on a line with an improvement on the notation. The rest of this thesis is divided into two parts. The first part is devoted to eigenvalues of quantum many-body systems (QMBS). I introduce Isotropic …
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Multipole Symmetries and Many Body Physics
… carry important ramifications for both quantum ground states and non-equilibrium dynamics. Particular emphasis is placed on Hubbard models with dipole moment conservation, which are of special interest due to their ability to be experimentally realized in strongly tilted optical lattices. The …
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Search for neutrinoless double beta decay of ¹¹⁶Cd and ⁸²Se and calorimeter simulations for the SuperNEMO experiment
… double beta decay (2[nu][beta][beta]) to the ground states of ¹¹⁶Sn and ⁸²Kr and to place a lower limit on the neutrinoless double becay decay (0[nu][beta][beta]) to the same ground states. Under the single-states dominance hypothesis, the 2[nu][beta][beta] half-lives are found to be T …
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Multiphoton ionization photoelectron spectroscopy of iodine-bearing molecules
… spin-orbit terms of the atomic iodine ground state. Subsequent 5-photon ionization at 532 nm from the $\sp2$P$\sb{3/2}$ and $\sp2$P$\sb{1/2}$ ground states of the fragment preferably produces ions in the $\sp3$P$\sb2$ and $\sp3$P$\sb1$ levels of the ion ground state. These results are …
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Study of thermal kinetics in artificial spin ice systems
… satisfied within the system. While the ground states of these artificial systems have been previously studied, this thesis focuses on the dynamic process around the ground state of these systems. In addition to the original square artificial spin ice, we also examine a collection of …
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Asymptotic stability and completeness in 2D nonlinear Schrodinger equation
… new results on the asymptotic stability of ground states of the nonlinear Schrödinger equation in space dimension two. Under our hypotheses, the result actually shows asymptotic completeness in the regime of small initial data, i.e. any small initial data evolves into a superposition of a …
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Matrix Isolation of Aryl(trifluoromethyl)carbenes, Heteroaryl(trifluoromethyl)carbenes and Phenylbis(trifluoromethyl)carbenes
… are photostable and have triplet ground states in matrices asmost of the other studied ary(trifluoromethyl)carbenes. The 1- and 2-naphthyl(trifluoromethyl)diazirines, the precursors of 1- and 2-naphthyl(trifluoromethyl)carbenes, have dissimilar geometric structures leading to …
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Simulation algorithms, Floquet phenomena and superconducting qubits
… quantum computational complexity of preparing ground states of Hamiltonians, focusing on the role of frustration. We identify a class of Hamiltonians which are close to being frustration free and point out that they have interesting complexity properties. We give a quantum algorithm for …
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