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Showing 1 to 20 of 58 for “"spin density"”.
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A Study of Omega-Zero Spin-Density Matrix Elements in the Reaction Negative Pion-Proton Going to Neutral Omega-Resonance Neutron at 3.65, 4.5, and 5.5 Gev/c
Made available in DSpace on 2015-05-12T22:38:45Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7207041.PDF: 1973655 bytes, checksum: 8e97fccaee54eca5d59800e73da23f41 (MD5) Previous issue date: 1971
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A Study of the Omega-Zero Spin-Density Matrix Elements in the Reaction Pi-Minus Proton Goes to Omega-Zero Neutron at 3.65, 4.5, and 5.5 GeV/c
A study was made of the WO spin-density matrix elements in the o reaction TI p~ n. The data were collected using a combination of scintillation counters and optical spark chambers designed to detect events of the type + TI p-TI TI yyn. Incident pions of momenta 3.65, 4.5, and 5.5 GeV/c were …
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A Study of the Omega-Zero Spin-Density Matrix Elements in the Reaction Pi-Minus Proton Goes to Omega-Zero Neutron at 3.65, 4.5, and 5.5 GeV/c
Submitted by Rachelle Ramer (rramer2@illinois.edu) on 2012-01-20T23:24:32Z No. of bitstreams: 1 1971_rosenberg.pdf: 2216476 bytes, checksum: aac4bf990c58ba48d8a149f866279450 (MD5)
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QUANTUM OBSERVABLES OF OPEN-SHELL SYSTEMS. A THEORETICAL STUDY
… observables of open-shell systems: the electron spin density and the phosphorescence energy gap. In the first part, a comprehensive theory of the electron spin density topology is proposed for the first time [1]. Several new notions (spin density critical points, molecular spin graphs, spin …
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Ab initio study of magnetic effects at material interfaces .
… This thesis will address (a) changes in spin density at grain boundaries and surfaces; (b) the impact of these changes on interfacial energies and structures; and (c) the behavior of point defects (including vacancies, impurities and adatoms) at interfaces. We first develop a simple, …
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Electronic Structure in the Organic-based Magnet [Feᴵᴵ(TCNE)(NCMe)₂][FeᴵᴵᴵCl₄] using the Orthogonalized Linear Combination of Atomic Orbitals Method with Hubbard U
… of Atomic Orbitals (OCLAO) methods. The Local Spin Density Approximation (LSDA) method plus the Hubbard U parameter is used to account for on-site atomic Coulombic repulsion and exchange correlation interactions for the d orbitals of the FeII atoms. Applying the Hubbard U parameter results in …
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1/F Noise & slow spin dynamics in chromium, chromium alloys, and disordered iron zirconium
1/f resistance noise studies of the spin dynamics in two magnetic systems are described in this thesis. In chromium, 1 If noise was used as a probe to study spin density wave polarization dynamics. Measurements of the noise anisotropy in a high quality single crystal of Cr revealed a temperature …
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Methods for Accurately Modeling Complex Materials
… with real world interest: screened hybrid density functional theory (DFT) used for accurate treatment of band gaps in semiconductors, spin density functional theory with the inclusion of spin-orbit interaction to model nanomagnetic systems, and novel empirical potentials that reproduce …
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Magnetic properties of the rare earth systems neodymium/yttrium and dysprosium/yttrium
… for the first time, the presence of the induced spin-density wave in the conduction band of nonmagnetic Lu atoms which are alloyed in a helimagnetic Dy host lattice. By tuning the incident synchrotron x-ray energy to the L$\rm\sb{III}$ edges of both Dy and Lu, we were able to use the …
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Non-equilibrium dynamics of dipole-coupled internal states in cold gases
… which results in the systems studied behaving as spin$-1/2$ models with long-range interactions. We first study a closed system with both static and resonant near-field dipole interactions under an external drive. By studying the uniform mean-field dynamics of the system, we find the dynamics are …
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Photoproduction of the Φ(1020) Meson in Neutral Decay Mode γP → ΦP → K(S)K(L)P
… <em>W</em>(cos θ) and <em>W</em>(Φ), and spin-density matrix elements, ρ<sup>0</sup>, in the Helicity and Gottfried-Jackson frames, in the energy range 1.6 GeV < E<sub>γ</sub> < 2.6 GeV. We analyzed the photoproduction data of the g11a experiment collected on an LH2 target using the CLAS …
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Phase diagram for the S equals one-half and J equals three-halves Kondo lattice model
… include antiferromagnetism, ferromagnetism, and spin-density wave ordering of both commensurate and incommensurate varieties. In S=1/2, the magnetic phase exhibits a spike in critical temperature at half-filling. In J=3/2, the Kondo phase is reentrant at weaker coupling but not at stronger …
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Penetration Depth Studies of Unconventional Superconductors
… borocarbides RENi2B2C (RE = Y, Lu, Er, Ho), the spin-triplet superconductor Sr2RuO4, and elemental Pb. From these studies we see how superconductivity is affected by the presence of another order, such as paramagnetism/antiferromagnetism (in ErNi2B2C) or spin-density-wave (in Pb). We also see how …
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Study of localization and correlation effects in disordered electronic systems
… susceptibility, and diffusion of charge-and spin-density fluctuations, for example. We have also investigated the effects of localization in the vicinity of magnetic instabilities on the Stoner criterion, Stoner excitations and the spin-wave mode. A macroscopic renormalization group study of …
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First-principles transition-metal catalysis : efficient and accurate approaches for studying enzymatic systems
… our approach to several paradigmatic systems: spin state splittings and structural properties of Fe2 and other small molecules as well as the addition-elimination reactions of hydrogen and methane on FeO+ to form water and methanol, respectively. We find that errors from common density …
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Orbital Polarization in Relativistic Density Functional Theory
… in an atom described by quantum numbers, spin (S), orbital (L), and total angular momentum (J) of its electrons. A set of guidelines, known as Hund's rules, discovered by Friedrich Hermann Hunds help us to determine the quantum numbers for the ground states of free atoms. The question ``to …
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Lie algebraic similarity transformations: improving wavefunctions for weak and strong correlations
… computational cost. The correlators include the density-density, collinear spin-spin, spin-density cross terms, and on-site double occupancy operators. The resulting non-Hermitian many-body Hamiltonian can be solved in a biorthogonal mean-field approach with only a small set of correlation terms …
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Simulation of Single -Electron Charging Effects in Planar Nanoscale Devices
By expanding the model to incorporate electron spin under the Local Spin Density Approximation, the charging properties of the double quantum dot are investigated in terms of electron spin and interdot interaction. It is shown that both electrostatic and quantum mechanical coupling between the dots …
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Angle-Resolved Photoemission Studies on the Many-Body Effects of High-Temperature Superconductor: Bi-2212
Spin fluctuations are defined as dynamic variations of spin density in both space and time. They are widely considered to play a essential role in the pairing mechanism of high temperature superconductors. Unconventional superconductors such as cuprates are believed to exhibit …
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Spin waves in doped graphene
Spin-waves have been studied to a great extent in solids and two-dimensional electron gases. These phenomena have garnered much interest in developing new kinds of devices for information processing and transmission. A major feature of these devices is that they would consume much less power than …
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