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 38 for “"spin-flip"”.
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Spin-flip scattering of conduction electrons from impurities
… of experiment, the effect of impurities on the spin orientation lifetime of conduction electrons. We have made a theoretical and experimental study of the effect of non-magnetic elemental impurities on the conduction electron spin resonance (CESR) in metals. By measuring the concentration …
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Spin-flip scattering of conduction electrons from impurities in molten sodium
… (Bi, Pt, Pd, and Ag) on the conduction electron spin resonance signal of sodium metal has been observed. Due to solubility problems, previous attempts to see effects from these impurities have been unsuccessful. By going into the molten state these problems were surmounted. The spin-flip …
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Magnetic field reversal effect in inter-Landau level absorption and simulated spin-flip Raman scattering in n-type InSb
… made of a magnetic field reversal effect in a spin-conserving inter-Landau level absorption transition. (ii) Advancements were made in the theory of intraband absorption and scattering processes. (iii) Experiments were carried out on the spin-flip Raman laser to examine crystal anisotropy. An …
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Experimental Measurements by Antilocalization of the Interactions between Two-Dimensional Electron Systems and Magnetic Surface Species
… can be used as a probe of quantum states. The spin-dependent interactions between controllable surface magnetism and itinerant electrons in a non-magnetic host provide insight for spin-based technologies, magnetic data storage and quantum information processing. This dissertation studies two …
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Efficient Fock Space Configuration Interaction Approaches For Large Strongly Correlated Systems
… introduce a novel formalism which combines the spin-flip (SF), ioniza- tion potential (IP), and electron affinity (EA) approaches. This redox spin-flip approach, the restricted active space spin-flip and ionization potential/electron affinity (RAS-SF-IP/EA) method, is applied to several …
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Probing the Dynamics of Pressure- and Magnetic Field -Tuned Transitions in Strongly-Correlated Electron Systems: Raman Scattering Studies
… decreases with decreasing temperature; (ii) a spin-disorder scattering regime, characterized by a collision-dominated electronic scattering response whose scattering rate Gamma scales with the magnetic susceptibility; (iii) a magnetic polaron (MP) regime, in which the development of an H = 0 …
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Spin Dependence in Polarized Proton-Proton Elastic Scattering at RHIC
… with the unique capability of RHIC to collide spin-polarized proton beams, allows STAR to study both the dynamics and the spin-dependence of the proton-proton (<em> pp</em>) elastic scattering process. Silicon strip detectors, installed inside the Roman Pots, measure tracks of protons scattered …
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Illuminating the Universe : New Probes of Reionization and Cosmology
… effect and fluctuations in the 21 cm spin flip transition of neutral hydrogen. We also propose to use the 21 cm signal to constrain cosmological parameters by probing the matter power spectrum. We also make use of the observable as s source screen for gravitational lensing by large …
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Electron Parameagnetic Resonance of the CH2CO2(-) Radical in Irradiated Zinc Acetate Dihydrate.
… lines were observed and interpreted as possible 'spin-flip' transitions. A temperature dependence of the coupling constants for the 2 protons was discovered from spectra taken at room temperature and at 133K. Single crystals of Zn(CH2DCO2)2.2H2O were irradiated and an analysis of the spectra …
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Magnetic fields near microstructured surfaces : application to atom chips
… thermal currents in the chip elements may induce spin flips of atoms and result in loss, heating and decoherence. In this thesis, we extend previous work on spin flip rates induced by magnetic noise and consider the more complex geometries that are typically encountered in atom chips: layered …
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Lowest Q² measurement of the [gamma] *p [right arrow] [Delta] reaction : probing the pionic contribution
… Delta, can be reached through a magnetic dipole spin flip of one of the quarks (M1) or through electric and Coulomb quadrupole terms (E2 and C2) which indicate a deviation from spherical symmetry. The quark models using the color hyperfine interaction underestimate the size of the quadrupole …
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Optimization of a microwave resonator cavity to perform electron spin resonance measurements on quantum dots
… on an ongoing experiment of detecting electron spin resonance (ESR) on AlGaAs/GaAs lateral quantum dots. The experiment is performed in a 2.5 Tesla magnetic field at temperatures around 100mK. A resonator cavity is used to expose the quantum dot to a perturbational microwave magnetic field pulse …
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Spin effects in single-electron transistors
… diamonds, inelastic cotunneling thresholds, the spin-1/2 Kondo effect, and Fano interference. With a magnetic field parallel to the motion of the electrons, single-particle energy levels undergo Zeeman splitting according to their spin. The g-factor describing this splitting is extracted in the …
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Mesoscopic wave phenomena in electronic and optical ring structures
… In Teil I der Arbeit befassen wir uns mit spinabhängigem Transport von Elektronen in effektiv eindimensionalen Ringen in Gegenwart inhomogener Magnetfelder. Wir benutzen die exakten Lösungen der Schrödinger-Gleichung im allgemeinen nicht-adiabatischen Fall in einem …
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Phonon-mediated Casimir effect
… in a two-dimensional ferromagnet accompanied by spin-flip processes. We show that an external magnetic field can be used to manipulate the properties of the single-layer system. For easy plain ferromagnets, at saturation value of the external field perpendicular to the easy axis, the Green’s …
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Studies of Highly Polar Atomic and Molecular Systems: Quantum Dynamics and the Route to Experimental Investigations
… result, and the commonly encountered spin-flip problem of a particle with spin located in a rotating magnetic field. This approach is applied to the avoided crossing between the n = 13, n1 − n2 = 11 (dipole moment of 532 D) and the n = 14, n1 − n2 = −12 (dipole moment of -657 D) highly …
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Quantum phenomena in disordered conductors
… quasi-lD conductors can be explained by the role spin-flip scattering plays in the electron dephasing rate.
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Quantum Hall transport in graphene and its bilayer
… & 3 filling factors does not exhibit low-energy spin flip excitation. These measurements are consistent with the formation of a quantum Hall ferromagnet. In addition, we observed insulating behavior in the two terminal resistance of the 𝝂 = 0 state at high fields. For monolayer graphene, we …
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Engineering the couplings to the continuum : controlling the fundamental properties of radiation and enabling forbidden light-matter
… emission, and intercombination processes such as spin-flip phosphorescence transitions. We find that plasmon polaritons in graphene can speed up spin-flip phosphorescence process by 7 orders of magnitude, that they can speed up two-photon spontaneous emission processes by 15 orders of magnitude, …
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