Temperature Dependence Of Electrostatic Discharge In Highly Disordered Polymers,
2017
Utah State University
Temperature Dependence Of Electrostatic Discharge In Highly Disordered Polymers, Tyler Kippen, Allen Andersen, Jr Dennison
Posters
No abstract provided.
Hemispherical Grid Retarding Field Analyzer Redesign For Secondary Electron Emission Studies,
2017
Utah State University
Hemispherical Grid Retarding Field Analyzer Redesign For Secondary Electron Emission Studies, Gregory Wilson
Presentations
No abstract provided.
Hemispherical Grid Retarding Field Analyzer Redesign For Secondary Electron Emission Studies,
2017
Utah State University
Hemispherical Grid Retarding Field Analyzer Redesign For Secondary Electron Emission Studies, Gregory Wilson
Conference Proceedings
No abstract provided.
Ferroelectricity And The Phase Transition In Large Area Evaporated Vinylidene Fluoride Oligomer Thin Films,
2017
University of Nebraska-Lincoln
Ferroelectricity And The Phase Transition In Large Area Evaporated Vinylidene Fluoride Oligomer Thin Films, Keith Foreman, Shashi Poddar, Stephen Ducharme, Shireen Adenwalla
Shireen Adenwalla Papers
Organic ferroelectric materials, including the well-known poly(vinylidene fluoride) and its copolymers, have been extensively studied and used for a variety of applications. In contrast, the VDF oligomer has not been thoroughly investigated and is not widely used, if used at all. One key advantage the oligomer has over the polymer is that it can be thermally evaporated in vacuum, allowing for the growth of complex heterostructures while maintaining interfacial cleanliness. Here, we report on the ferroelectric properties of high-quality VDF oligomer thin films over relatively large areas on the order of mm2. The operating temperature is identified via …
Schrödinger Theory Of Electrons In Electromagnetic Fields: New Perspectives,
2017
CUNY Graduate Center
Schrödinger Theory Of Electrons In Electromagnetic Fields: New Perspectives, Viraht Sahni, Xiao-Yin Pan
Publications and Research
The Schrödinger theory of electrons in an external electromagnetic field is described from the new perspective of the individual electron. The perspective is arrived at via the time-dependent "Quantal Newtonian" law (or differential virial theorem). (The time-independent law, a special case, provides a similar description of stationary-state theory). These laws are in terms of "classical" fields whose sources are quantal expectations of Hermitian operators taken with respect to the wave function. The laws reveal the following physics: (a) in addition to the external field, each electron experiences an internal field whose components are representative of a specific property of the …
Electron Correlations In An Excited State Of A Quantum Dot In A Uniform Magnetic Field,
2017
Sacred Heart University
Electron Correlations In An Excited State Of A Quantum Dot In A Uniform Magnetic Field, Marlina Slamet, Viraht Sahni
Publications and Research
Electron correlations in a two-electron two-dimensional ‘artificial atom’ or quantum dot (with harmonic confining potential) in the presence of a uniform magnetic field in an excited singlet state are studied via quantal density functional theory (QDFT). QDFT allows for the separation of the electron correlations due to the Pauli exclusion principle and Coulomb repulsion, as well as the determination of the contribution of these correlations to the kinetic energy. The QDFT mapping is from the excited state of the quantum dot to one of noninteracting fermions in their ground state possessing the same basic variables of the density and physical …
Density Of State Models And Temperature Dependence Of Radiation Induced Conductivity,
2017
Utah State University
Density Of State Models And Temperature Dependence Of Radiation Induced Conductivity, Jodie Corbridge Gillespie, Jr Dennison, Alec M. Sim
Journal Articles
Expressions are developed for radiation induce conductivity (RIC) over an extended temperature range, based on density of states models for highly disordered insulating materials. A general discussion of the DOS of can be given using two simple types of DOS distributions of defect states within the bandgap for disordered materials are considered, one that monotonically decreases within the bandgap and one with a distribution peak within the band gap. Three monotonically decreasing models (exponential, power law, and linear), and two peaked models (Gaussian and delta function) are considered, plus limiting cases with a uniform DOS for each type. Variations using …
Dynamic Secondary Electron Emission In Dielectric/Conductor Mixed Coatings,
2017
Instituto de Ciencia de Materiales de Madrid
Dynamic Secondary Electron Emission In Dielectric/Conductor Mixed Coatings, Leandro Olano, Maria E. Davila, A. Jacas, M A. Rodriguez, Jr Dennison
Conference Proceedings
No abstract provided.
Degradation Effects Of Ionizing Radiation On Spacecraft Components And Biological Samples,
2017
Utah State University
Degradation Effects Of Ionizing Radiation On Spacecraft Components And Biological Samples, Alex Souvall
Senior Theses and Projects
No abstract provided.
Uv Degradation Of Polycarbonate,
2017
Utah State University
Uv Degradation Of Polycarbonate, Katie Gamaunt
Senior Theses and Projects
No abstract provided.
Temperature Dependence Of Electrostatic Discharge In Highly Disordered Polymers,
2017
Utah State University
Temperature Dependence Of Electrostatic Discharge In Highly Disordered Polymers, Tyler Kippen, Allen Andersen, Jr Dennison
Posters
No abstract provided.
Dynamic Secondary Electron Emission In Dielectric/Conductor Mixed Coatings,
2017
Instituto de Ciencia de Materiales de Madrid
Dynamic Secondary Electron Emission In Dielectric/Conductor Mixed Coatings, Leandro Olano, Isabel Montero, Maria E. Davila, Jr Dennison
Presentations
No abstract provided.
Satellite Survivability In Space: A Materials Perspective,
2017
Utah State Univesity
Satellite Survivability In Space: A Materials Perspective, Jr Dennison
Presentations
No abstract provided.
Anomalous Photovoltaic Effect In Organic-Inorganic
Hybrid Perovskite Solar Cells,
2017
University of Nebraska - Lincoln
Anomalous Photovoltaic Effect In Organic-Inorganic Hybrid Perovskite Solar Cells, Yongbo Yuan, Tao Li, Qi Wang, Jie Xing, Alexei Gruverman, Jinsong Huang
Alexei Gruverman Publications
Organic-inorganic hybrid perovskites (OIHPs) have been demonstrated to be highly successful photovoltaic materials yielding very-high-efficiency solar cells. We report the room temperature observation of an anomalous photovoltaic (APV) effect in lateral structure OIHP devices manifested by the device’s open-circuit voltage (VOC) that is much larger than the bandgap of OIHPs. The persistent VOC is proportional to the electrode spacing, resembling that of ferroelectric photovoltaic devices. However, the APV effect in OIHP devices is not caused by ferroelectricity. The APV effect can be explained by the formation of tunneling junctions randomly dispersed in the polycrystalline films, which allows …
Theoretical Approach To Electroresistance In Ferroelectric Tunnel Junctions,
2017
Georgia Institute of Technology
Theoretical Approach To Electroresistance In Ferroelectric Tunnel Junctions, Sou-Chi Chang, Azad Naeemi, Dmitri E. Nikonov, Alexei Gruverman
Alexei Gruverman Publications
In this paper, a theoretical approach comprising the nonequilibrium Green’s function method for electronic transport and the Landau-Khalatnikov equation for electric polarization dynamics is presented to describe polarization-dependent tunneling electroresistance (TER) in ferroelectric tunnel junctions. Using appropriate contact, interface, and ferroelectric parameters, the measured current-voltage characteristic curves in both inorganic (Co/BaTiO3/La0.67Sr0.33MnO3) and organic (Au/PVDF/W) ferroelectric tunnel junctions can be well described by the proposed approach. Furthermore, under this theoretical framework, the controversy of opposite TER signs observed experimentally by different groups in Co/BaTiO3/La0.67Sr0.33MnO3 systems is …
Comment On “Electronic Structure Of Mo(1−X)Rex Alloys
Studied Through Resonant Photoemission Spectroscopy”,
2017
University of Nebraska–Lincoln
Comment On “Electronic Structure Of Mo(1−X)Rex Alloys Studied Through Resonant Photoemission Spectroscopy”, Prescott Evans, Peter A. Dowben
Peter Dowben Publications
Further analysis of the resonant photoemission data, found within Sundar et al (2016 J. Phys.: Condens. Matter 28 315502), show the intensities do not follow the elemental composition in the Mo1−xRex alloy. Similar trends are observed in the published data for Gd1−xNix alloy films. The analysis of the resonant photoemission intensities suggests that Mo in the Mo1−xRex alloy and Gd in the Gd1−xNix alloy have nearest neighbor bonds to Re and Ni respectively. This means the A–B bond is favored over the average of …
Study Of The Photoluminescence Spectra Of Mg-Doped Gan,
2017
Virginia Commonwealth University
Study Of The Photoluminescence Spectra Of Mg-Doped Gan, Puranjan Ghimire
Theses and Dissertations
We have studied luminescence properties of Mg-doped GaN grown by hydride vapor phase epitaxy. Steady state photoluminescence (PL) spectra have been analyzed. Exciton, ultraviolet luminescence (UVL) and blue luminescence (BL) bands are the dominant PL bands in the spectra. At low temperature, Exciton and UVL bands show almost no shift with excitation intensity, whereas the BL band blueshifts by almost 0.4 ���� with increasing excitation intensity by seven orders of magnitude. Such shifting nature of bands with excitation intensity is explained by assuming that the BL band is detected from the region of the sample where potential fluctuations are very …
Temperature Dependence Of Dynamical Spin Injection In A Superconducting Niobium Thin Film,
2017
University of Central Florida
Temperature Dependence Of Dynamical Spin Injection In A Superconducting Niobium Thin Film, Tyler S. Townsend
Honors Undergraduate Theses
Spintronics is a research field that focuses on the manipulation of the quantum mechanical spin of charge carriers in solid state materials for future technological applications. Creating large spin currents with large relaxation times is sought after in the field of spintronics which may be aided by combining spintronics with superconductivity. This thesis provides a phenomological study of the effective change in ferromagnetic resonance linewidth, by dynamical spin injection into a permalloy-copper-niobium tri-layer in the superconducting state. The ferromagetic resonance linewidth was measured from 2-14 K. It was observed that there was a change in the behavior of the resonance …
Light Soaking Phenomena In Organic-Inorganic Mixed Halide Perovskite Single Crystals,
2017
Old Dominion University
Light Soaking Phenomena In Organic-Inorganic Mixed Halide Perovskite Single Crystals, Hye Ryung Byun, Dae Young Park, Hye Min Oh, Gon Namkoong, Mun Seok Jeong
Electrical & Computer Engineering Faculty Publications
Recently, organic inorganic mixed halide perovskite (MAPbX3; MA = CH3NH3+, X = Cl-, Br-, or I-) single crystals with low defect densities have been highlighted as candidate materials for high-efficiency photovoltaics and optoelectronics. Here we report the optical and structural investigations of mixed halide perovskite (MAPbBr3-xIx) single crystals. Mixed halide perovskite single crystals showed strong light soaking phenomena with light illumination conditions that were correlated to the trapping and detrapping events from defect sites. By systematic investigation with optical analysis, we found that the …
Power Distribution Of Terahertz Emission From Hexagonal Bscco Microstrip Antennas,
2017
University of Central Florida
Power Distribution Of Terahertz Emission From Hexagonal Bscco Microstrip Antennas, Andrew E. Davis
Honors Undergraduate Theses
We analyze the distribution of coherent terahertz radiation from a regular hexagonal microstrip antenna (MSA) made from the high-Tc superconductor Bi2Sr2CaCu2O8+x (BSCCO). We discuss the C6v symmetry of the solutions of the wave equation on a hexagonal domain and distinguish between the closed-form and non-closed-form solutions. The closed-form wavefunctions of the transverse magnetic (TM) electromagnetic cavity modes are presented and formulas for the radiated power arising from the uniform part of the AC Josephson current and from the resonant cavity modes are derived. The wavefunctions and angular distribution of radiation from …
