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Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
A promising proposal for quantum computation, due to Loss and DiVincenzo, is based on using electron spins in quantum dots as qubits - two-level systems which are the quantum analogues of classical bits. Two-qubit operations (quantum...
Understanding the theory of how massive stars die is an important astrophysical challenge. An important result in core-collapse supernova (CCSN) theory is that spherically-symmetric, one-dimensional simulations routinely fail to explode, ...
Compute grids for applications have the potential to solve significant issues which contribute to low data processing and publication rates. This potential includes an ability to transparently manage large amounts of data and to greatly...
This dissertation presents the results from three major experiments to investigate angular momentum induced structural or shape changes in A~160 and A~110 atomic nuclei. The basic question we are trying to answer is "How do the...
If one could be built, a quantum computer would be capable of storing and manipulating quantum states with sufficient accuracy to carry out computations that no classical computer can do (most notably factoring integers in polynomial...
New to physics, the experiments of this dissertation successfully acquired clear and extensive direct measurements in He II at 1.7 K of quantum turbulence induced by second sound shock pulses in a wide channel. Such pulses are moving...
The Search for N* Resonances: Measurement of Differential Cross Sections and Polarization Observables for γp → pω and γp → K0Σ+ Using Circularly-Polarized Photons at CLAS, Jefferson Lab
The study of baryon resonances offers a deeper understanding of the strong interaction, since the dynamics and relevant degrees of freedom hidden within them are reflected by the properties of these states. The baryon resonances have...
The discovery of graphene marked a turning point in research and interest towards 2 -D materials. Among them, Transition Metal Dichalcogenides (TMDs) and Metal Monochalcogenides (MM) have seen an upturn in interest owing to their...
Investigation of nuclei with neutron and proton imbalance is at the forefront of nuclear physics research today, along with how the nuclear structure varies with the movement of the nucleons. Experimental data and theoretical models work...
The Large Hadron Collider is pushing high energy physics in to a brand new territory. This extraordinary era may bring discoveries of unprecedented magnitude, delivering validation or extreme dissappointment to the physics theories of...
The 14C(14C, d) reaction at 22 MeV was used to study Tz=2 26Na. Charged particles were detected with a Si detector telescope at 0º, and γ transitions in coincidence were detected with an array of three Compton-suppressed "clover"...
We study the unusual transport behavior driven mostly by the correlations between the charge carriers in lattice and continuum systems. The strongly correlated systems are studied in the classical limit where the Coulomb interaction...
Clustering of α particles plays an important role in light atomic nuclei. For example, multicenter structures built on the well-known low-lying states of 8Be can be formed. The addition of nucleons to the system may result in covalent...
In this dissertation, we study three biological applications of networks. The first one is a biological coevolution model, in which a species is defined by a genome in the form of a finite bitstring and the interactions between species...
The thesis presents the recent development of the 3rd generation femtosecond electron diffractometer in Professor Jim Cao's group and its application to study ultrafast processes in real time. The research activities cover two main...
Two big questions in physics beyond the Standard Model of particles are nature of Dark Matter and a theory of Quantum Gravity. In this work, topics related to both of these improtant questions are presented. First, we introduce an...
Geometrically frustrated systems have garnered much interest in recent times due to the emergence of novel magnetic states in these systems that contrast traditional cooperative magnetic phenomena. The spin ice pyrochlores Ho2Ti2O7 and...
The interest in cryo-electron microscopy has been reinvigorated by the recent introduction of direct electron detectors and the development of new software. Images of frozen proteins can now be collected with significantly higher signal...
In this dissertation, the use of on-chip superconducting (SC) resonators as a probe of spin-photon interactions as well as other superconducting phenomena will be presented. In particular, coherent Rabi oscillations are demonstrated for...
Transition metal dichalcogenides (TMDs or TMDCs) have garnered much interest recently due to their weakly layered structures, allowing for mechanical exfoliation down to a single atomic layer. As such, it is pertinent to re-examine the...
Two heavy Fermion superconducting compounds, URu₂Si₂ and PuRhIn₅, were investigated by the techniques of chemical substitution and application of high magnetic fields. These materials are particularity interesting for their unique...
Measurement of Polarization Observables in Vector Meson Photoproduction Using a Transversely-Polarized Frozen-Spin Target and Polarized Photons at CLAS, Jefferson Lab
The study of baryon resonances provides a deeper understanding of the strong interaction because the dynamics and relevant degrees of freedom hidden within them are reflected by the properties of the excited states of baryons. Higher...
We report a study on the magnetotransport properties and on the Fermi surfaces (FS) of the ZrSi(Se, Te) semimetals. Density Functional Theory (DFT) calculations, in absence of spin orbit coupling (SOC), reveal that both the Se and the Te...
The technique of studying nuclear structure under the rigors of high angular momentum through the examination of γ-ray cascades has recently undergone an explosion in productivity. These advances have been brought on primarily by the...
An interpretation of CMS searches for evidence of supersymmetry in the context of the minimal supersymmetric Standard Model (MSSM) is given. It is found that supersymmetric particles with color charge are excluded in the mass range below...
The formation of sub-structures within an atomic nucleus, appropriately termed nuclear clustering, is one of the core questions of nuclear many-body physics. In this thesis, we put forward a new method for the study of nuclear clustering...
In this thesis, we study the entanglement properties of quantum systems to characterize quantum phases and phase transitions. We focus on the free fermion lattice systems and we use numerical calculation to verify our ideas. Behavior of...
When placed in a strong magnetic field, a two-dimensional electron gas can exhibit the quantum Hall effect in which a step like pattern forms in the Hall resistance, RH, which is defined to be the voltage drop perpendicular to the...
One of the remaining puzzles in particle physics is the origin of electroweak symmetry breaking. In the Standard Model (SM), a single doublet of complex scalar fields is responsible for breaking the SU(2)L × U(1)Y gauge symmetry, thus...
Several models for materials of much current interest in condensed matter physics have been numerically studied, using unbiased methods, including Monte Carlo simulations and exact treatment of the fermionic trace at finite temperature....
Understanding properties of quasiparticles in novel two-dimensional (2D) semiconductors, such as atomically thin transition metal dichalcogenides (TMDCs) and group-III metal monochalcogenides, is among the most interesting topics in...
The evolution of material structures is governed by the making and breaking of chemical bonds and the rearrangement of atoms, which occurs on the time scale of an atomic vibrational period, hundreds of femtoseconds. Atomic motion on this...
In this study three projects are described that investigate the transport properties of the ferromagnetic semiconductor, EuS, as well as devices based on the half metal, CrO2. These materials are expected to be highly spin-polarized...
In transition metal oxides, such as A2B2O7, the B-site cations typically govern many of the fundamentally and technologically interesting properties. The cubic pyrochlore oxides, A2B2O7, have attracted much attention over the past 20...
Multi-strange baryons have played an important role in understanding the strong interaction. Despite their importance to advancing quantum chromodynamics (QCD), little is known about such hyperons due to the lack of a strange probe....
Electrostatic interactions play an important role in many aspects of the structural and functional properties of biomolecules because of their long-range behavior. The nonlinear Poisson-Boltzmann equation (NLPBE) theory has long been...
Separations were performed on double stranded DNA (dsDNA) using electrophoresis. Electrophoresis is the steady transport of particles under the influence of an external electric field. Double stranded DNA fragments ranging in length from...
We perform an analysis dedicated to the search for new and unusual strangeonium states produced in the reaction γp → pφη. The data used for this analysis was recorded during the Spring 2017 physics run for Hall D of Thomas Jefferson...
Dendritic spines are small protrusions from dendrites on which the majority of excitatory synapses occur (Gray, 1959; Peters et al., 1976; Harris and Kater, 1994). Dendritic spines serve to compartmentalize second messenger systems (Koch...
This work presents a comprehensive gamma-ray spectroscopic study to the higher spin structure of ³¹Si, including its excitation energies, spins, and branching ratios, along with the shell model discussions. ³¹Si was produced through the...
Baryon and hybrid baryon wave functions were built from harmonic oscillator basis states with explicit flavor and color. The Relativized Constituent Quark Model was extended to calculate more baryon states. Improvements were made to the...
In this dissertation we explore three topics: 1) the extraction of the proton radius from electron scattering data; 2) the reconstruction of neutron distributions in nuclei from parity violating experiments; and 3) the propagation of...
We present results of a search for single top quark production in pp collisions using a dataset of approximately 1 fb−1 collected with the DØ detector. This analysis considers the muon+jets and electron+jets final states and makes use of...
Liquid crystal phases exhibit physical characteristics that lie between those of liquid and crystal phases. The many liquid crystal sub-phases are defined based on the degree of positional and orientational ordering the molecules have...
Quantum computing gives novel way of computing using quantum mechanics, which furthers human knowledge and has exciting applications. Quantum systems with diluted spins such as rare earth ions hosted in single crystal, molecule-based...
This dissertation represents a set of work in the field of semiconductor spintronics. We address an important issue in this field that involves spin injection efficiency in spintronics devices from a ferromagnet into a non-magnetic...
An experimental examination of low-lying proton resonances in 26Si was conducted using the proton transfer reaction, d(25Al, 26Si)n. This reaction is analogous to the direct single proton capture, 25Al(p, g)26Si, of astrophysical...
This dissertation examines the theoretical and computational methods needed to calcu- late opto-electronic multiple-carrier excitation rates in strongly correlated insulators (SCI). Through several studies, we find that we are able to...
Proteins are flexible and dynamic. One static structure alone does not often completely explain biological functions of the protein, and some proteins do not even have high resolution structures. In order to provide better understanding...
Wavelength tunability or bandgap tuning of mixed halide perovskite, CsPb(IxBry)3 (y=1-x), can be achieved by changing the composition of iodide and bromide ions but under continuous illumination the photoluminescence (PL) peak position...
Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
