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 29 for “"eigenstate"”.
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Aspects of Eigenstate Thermalization
For chaotic quantum many-body systems, the eigenstate thermalization hypothesis (ETH) posits that energy eigenstates contain the properties of equilibrium ensembles. Many subsequent devel- opments have demonstrated the centrality of random matrix theory and free probability to the ETH. This thesis …
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Iteration Methods For Approximating The Lowest Order Energy Eigenstate of A Given Symmetry For One- and Two-Dimensional Systems
… the approximation of the lowest order energy eigenstate of a given symmetry; as well as an approximation to the energy eigenvalue of the same order.
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Momentum evolution numerics of an impurity in a quantum quench
… and revivals are caused by disjoint sets of eigenstate transitions, and this fact is used to interpret some of their aspects. This attribution of momentum features to different eigenstate subsets allows quantitative reproduction of these features with much less computational expense than has …
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Search for CP violation in D-meson decays
… the magnitude of the CP asymmetry Acp for the CP eigenstate no -+ K+ K-. This falls within the preexisting limit of .45 @90% CL set by FNAL experiment E691 using the same decay. The first measurement of Acp is made for two other CP eigenstates, no -+ K2 K2 and no -+ 1r+1r-. An upper limit for the …
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A measurement of B⁰ anti-B⁰ oscillations using fully-reconstructed hadronic B decays at BaBar
… reconstructed in a hadronic decay to a flavor eigenstate. The flavor of the other B in the event is determined using an inclusive tagging algorithm which exploits the correlations between the flavor of the b quark and the charges of its decay products. By fitting the decay-time distribution of …
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A THEORETICAL INVESTIGATION OF PROSPECTS FOR MODE SELECTIVE OVERTONE PHOTOCHEMISTRY (QUANTUM DYNAMICS)
… These delocalized excitations are very eigenstate specific, which leads to yet another hypothesis. Multiple laser excitation, each laser tuned to a different excited eigenstate, will lead to coherent superpositions of these states, which may lead to destructive interference in chemically …
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A variational approach to hadron structure in lattice QCD
… for the isolation of terms relevant to a single eigenstate or eigenstate transition, we show that this method is both an effective way to remove excited state contamination from the study of ground state systems and an effective framework through which one can study the structure of hadronic …
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Search for CP violation in D-meson decays
… of the CP asymmetry $A\sb{cp}$ for the CP eigenstate $D\sp0\to K\sp+K\sp-.$ This falls within the preexisting limit of.45 @ 90% CL set by FNAL experiment E687 using the same decay. The first measurement of $A\sb{cp}$ is made for two other CP eigenstates, $D\sp0\to K\sbsp{s}{0}K\sbsp{s}{0}$ …
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Light-Front Coupled-Cluster Method In Phi-Four Field Theory
… Inparticular, we obtain the masses of the lowest eigenstate as a function of the coupling strength and study the behavior of the wavefunction components. The calculation was facilitated by the construction of a new type of fully symmetric multivariate polynomials used as basis functions for the …
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Meson Photo-Couplings From Lattice Quantum Chromodynamics
… operators designed to interpolate a single meson eigenstate, which are constructed as variationally optimized linear combination of meson interpolating fields within a large basis. In order to frame the results we also explore some well known phenomenology arising within the context of the …
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Study of flavor tagging with semi-exclusive reconstruction of b [right arrow] D(sigma)X decays
… in which one of the mesons decays into a CP eigenstate. By measuring the decay time distribution separately for B⁰ and B̄⁰ decays the CP violating asymmetry and sin 2[beta] can be measured. In order to measure the decay time distribution for the B⁰ and B̄⁰ decays, it is necessary to identify …
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Spin Dynamics in a Tunable Heisenberg Magnet Realized with Ultracold Atoms
… the ground state, which are even exact many-body eigenstates. For this we utilize quantum quenches from initial far-from-equilibrium spin-helix patterns: Spin transport: By using a longitudinal spin-helix pattern, which involves a modulation in the population of spin up and spin down atoms, we see …
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Many-body effects in metals, modulation doped quantum wells and doped semiconductors
… equation, obtain expressions for the many-body eigenstate& in a convenient basis and use them to understand the behavior of the system. In the case of a localized hole with infinite mass, we diagonalize the Hamiltonian exactly using first a wavefunction and then a noncanonical transformation. …
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Stabilization of autoionizing states
… This state of the atom was not an energy eigenstate but a non-stationary wavepacket. The evolution of these wavepackets was monitored by changing the timing between the exciting "pump" laser and the stimulating "probe" laser"--Abstract, page iv.</p>
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Artificial Neural Networks for Programming Quantum Annealers
… system remains in an instantaneous ground energy eigenstate of a time-dependent Hamiltonian. Our research focuses on the diabatic regime where the quantum state does not necessarily remain in the ground state during computation. Concretely, we explore a setup for performing classification on …
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Development of a Wavelet -Based Algorithm and Fitness Function for Computational and Experimental Quantum Control of Intramolecular Vibration Redistribution
… redistribution (IVR)---required knowledge of the eigenstate-resolved phase and amplitude structure of the wavepacket. Experiments, however, can not provide such informa tion except at very high cost so such approaches are only useful for computational modeling of the control process. A reliable …
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Making Nuclear Magnetic Hyperpolarization Practical through Storage in Disconnected Eigenstates
… spin-lattice relaxation time, T1. Disconnected eigenstates provide a mechanism by which hyperpolarization can be stored for several times T1. This thesis contributes to the knowledge of these states in four important ways. First, the decay of hyperpolarized magnetization of gas is simulated in …
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Dynamic Homogenization Of Linear Waves In Periodic Media And Origami-Inspired Structures
… acting on the structure, the “activated” Bloch eigenstates of the lattice are iden- tified and classified depending on the multiplicity of participating energy levels. In the vicinity of an isolated dispersion surface (single energy level), an effective field equation with homogenized source …
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Value Indefiniteness, Randomness and Unpredictability in Quantum Foundations
… A is value indefinite unless j i is an eigenstate of A. The indeterministic nature of quantum measurements does little to explain how the quality of quantum randomness differs from classical randomness. We show that, subject to certain physical assumptions, a sequence of bits generated …
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