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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.
Nb 3 Sn conductors are important candidates for high-field magnet applications for Future Protonor Muon Colliders, and they continue to be widely used for many laboratory and NMR magnets. However, the critical current density, J c, of...
One of the biggest roadblocks currently in the way of large scale quantum computation is the limited relaxation times of the current state of the art quantum computers. This limitation is due to the use of superconducting qubits, which...
This dissertation focuses on the transport properties of the high-temperature superconductor LSCO in high magnetic fields, particularly the longitudinal magnetoresistance around optimum doping. In this region of the phase diagram the...
This dissertation is a theoretical and computational examination of electronic properties of topological materials, such as topological insulators and Weyl semimetals. Our work is motivated by various experimental observations and...
The heavy fermion intermetallic compound URu₂Si₂ continues to attract attention owing mainly to the occurrence of an unknown ordered state at T₀ ~ 17.5 K that is referred to as "hidden order" (HO). HO remains enigmatic, despite more than...
Magnetic two-dimensional (2D) materials, proposed to exhibit non-trivial electronic topology, have been discovered recently. In particular, a potential for devices based on van der Waals (vdW) ferromagnetic heterostructures was...
The dissertation presents the recent development of the 3rd generation femtosecond electron diffractometer in Professor Jim Cao's group. Two techniques, femtosecond electron shadow imaging and deflectometry (FESID) and femtosecond...
We examine two wave function optimization methods for producing the ground state. The first is a novel method for optimizing the location of the nodes of the fermion ground-state using a combination of diffusion Monte Carlo (DMC) and...
The understanding of the electronic systems of materials has not been only the essential, but the driving force, behind the progress of technology for over 100 years. This year marks the 60th anniversary of the revolutionary Bardeen...
This dissertation explores several aspects of microwave spectroscopy of two-dimensional electron systems (2DES), motivated by the microwave signatures of Wigner crystal phases that can exist in these systems. The spectroscopy is carried...
This dissertation is a theoretical and computational examination of structural, electronic and magnetic properties of complex transition metal oxide structures. Our work is motivated by experimental observations that transition metal...
This dissertation presents the recent developments and experiments performed using the third generation femtosecond electron diffractometer in Professor Jianming Cao's group as well as experiments performed using the previous second...
The exploration of combinatorial mixtures in liquid/liquid extraction and phase-transfer catalysis represents a groundbreaking shift in the understanding and application of complex organic systems in chemistry and biology. By...
Disorder has intriguing consequences for correlated electronic materials, which include several families of high-temperature superconductors and resistive switching systems. In this dissertation, we study the effects of impurities...
This dissertation presents a series of electron paramagnetic resonance investigations on molecule-based magnetic materials. We begin with an introduction to the field of Single-Molecules magnets in the Ch. 1 introduction. In Ch. 2 we...
Doubly-connected superconducting loops are a class of superconducting devices of longstandinginterest in fundamental physics and practical applications. They have been studied since early 1960s and have received intensive recent interest...
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...
We utilize crystal symmetry to develop low-energy models for a broad range of superlattice devices composed of stacks of FeSe (and similar iron-based superconductors), with the aim of engineering experimentally tunable couplings through...
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...
The dissertation presents the recent development of the third-generation femtosecond electron diffractometer in Professor Jim Cao's group. Two techniques, femtosecond electron shadow imaging and deflectometry (FESID) and femtosecond...
This thesis is devoted to the study of magnetic properties of strongly correlated quantum matters in one and two dimensions. The study employs predominantly numerical techniques, such as Exact Diagonalization (ED), Finite Temperature...
High field magnets are integral to the success of various significant scientific and technological endeavors such as materials characterization, high energy physics, and plasma fusion generators. Superconductors are integral to building...
This work reports on the first efforts at FSU's John D. Fox Accelerator Laboratory to study the nuclear structure of states embedded in the continuum through particle-unbound angular correlations. As part of this work, two principle...
Bosons play an important role in the study of emergent phenomena, such as the appearance of effective degrees of freedom, symmetries, and phase transitions. In this work, we use an ensemble of Hamiltonians with two-body interactions with...
Since the discovery of the exotic properties of graphene, two dimensional materials such as metal chalcogenides, transition metal oxides and other 2D compounds have gained renewed interest. Graphene, silicene, germanene, graphyne and...
Backbending, Seniority and Pauli Blocking of Pairing Correlations at High Rotational Frequencies in Rapidly Rotating Nuclei: A Systematic Analysis of Er, Yb, Hf and W Isotopes and Nuclear Structure Studies of ¹⁷⁹, ¹⁸⁰W, ¹⁶⁰, ¹⁶¹Gd and ¹⁵⁵Sm
The goal of nuclear structure experiments is to understand how properties of nuclei evolve as a function of key observables such as proton and neutron numbers, deformation, angular momentum and excitation energy, to name a few. In order...
Halide Perovskites have recently risen as a new class of optoelectronic materials. Remarkable optical and electrical properties have led to the demonstration of various perovskite-based devices such as solar cells1, LEDs2-5, ...
Observation of Gap-like Features in Superconductors and Heavy Fermions via Quasiparticle Scattering and Tunneling Spectroscopies, and Electronic Transport
Electron spectroscopies are powerful tools to reveal Fermi surface gapping in intermetallic systems. In particular, planar tunneling spectroscopy (PTS) and quasiparticle scattering spectroscopy (QPS, also known as point-contact...
High-purity niobium is the material of choice for making superconducting radio-frequency cavities for the modern particle accelerator. While making the cavities from the Nb sheet, it goes through a series of processes including chemical...
Semiconductor spintronics is widely regarded as a viable pathway to overcome many of the physical limitations of the present micro-electronics technology. Electrical spin injection into a semiconductor, coherent transport and...
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...
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...
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...
At low temperature (T) and weak magnetic field (B), two dimensional electron systems (2DES) can exhibit strong 1/B-periodic resistance oscillations on application of sufficiently strong microwave radiation. These oscillations are known...
Strong electron-electron correlations in physical systems can lead to phenomena that are not trivial composition of constituent parts, that the collective behavior lead to emergence of exotic phases and behaviors. To describe exotic...
Electron paramagnetic resonance (EPR) spectroscopy is a powerful technique to study biomolecules. EPR has been employed to investigate the structure and dynamics of biological membranes, membrane proteins, and protein-lipid interactions....
Two experiments have been performed at Florida State University using the FSU Compton- Suppressed HPGe Array and associated particle telescope. The first experiment used the 9Be(18O, pnγ) reaction at 35 MeV to study the nuclear structure...
Semiconductor spintronics has been widely regarded as a viable pathway to overcome many limitations in the current microelectronics technology. Molecular spintronics, an emerging research area in spintronics, aims to incorporate the...
The study of exotic nuclei, and their implication for Astrophysics have become a driving force in low-energy nuclear science, nationally recognized by the construction of the Facility for Rare Isotope Beams (FRIB) laboratory. To maximize...
Quantum computers are predicted to outperform classical computers in certain tasks, such as factoring large numbers and searching databases. The construction of a computer whose operation is based on the principles of quantum mechanics...
In this dissertation we have created theoretical models for finite nuclei, nuclear matter, and neutron stars within the framework of relativistic mean field (RMF) theory, and we have used these models to investigate the elusive isovector...
Nanoscience and nanotechnology research has provided us with new paradigms of technologies to improve human life, but still there is plenty of room to expand its frontiers. In order to do so, we need to pursue the development and study...
In this dissertation, we investigate the edge spin excitations and reconstructions of quantum Hall (QH) liquids. Edge spin reconstructions reflect the interplay of confining potential, electron-electron interaction, and Zeeman splitting...
This dissertation presents studies on mononuclear single molecule magnets (SMMs) with magnetic properties arising from transition metal ions in trigonal bipyramidal (TBP) coordination environments. We use both experimental and...
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