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Showing 1 to 20 of 721 for “"excitations"”.
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Local optical excitations in metals
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-09T19:39:58Z No. of bitstreams: 1 1983_gibbs.pdf: 5024695 bytes, checksum: b2d69b6b84846603b7c32f4a6184112b (MD5)
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Optical excitations in cold gases
… sensitive to interactions. We find that optical excitations, at temperatures low enough for the thermal de Broglie wavelength to be larger than the scattering length, become collective modes. We study collective affects in the optical spectrum both above and below Bose-Einstein condensation, and …
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Capture and control of excitations
… understanding of the capture and control of excitations, including photons and excitons, in optoelectronic devices is important to optimizing their performance. Devices such as luminescent solar concentrators and signal concentrators that increase the efficiency of solar energy production and …
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Magnetic Excitations in Cylindrical Multilayered Nanostructures
… between electromagnetic waves and the dipolar SW excitations. This involves solving for the dynamical response using the full form of Maxwell's equations with retardation effects. Another extension is to the dipole-exchange SW in magnetic nanotubes. This is applicable at larger wavevectors, where …
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Elementary excitations in heavy-fermion superconductors
… theoretical study is presented of the elementary excitations in heavy-fermion superconductors, under the hypothesis that the Cooper pairs are in a relative p-wave or d-wave. First, all p-wave and d-wave states are classified in the presence of strong spin-orbit coupling and crystal fields, which …
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Fundamental Excitations of Nonconservative Quantum Fluids
The study of Bose-Einstein condensates (BECs) has represented a core subject of physics for decades. Recently however, experiments have demonstrated a fundamentally distinct, inherently nonequilibriated class of BEC from photonic quasiparticles known as exciton-polaritons (polaritons). These …
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Charge fluctuations in fractionally charged excitations
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1982.
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Bogoliubov Excitations of Inhomogeneous Bose-Einstein Condensates
… condensate (mean-field) and the Bogoliubov excitations, which are bosonic quasiparticles. The disorder potential causes an imprint in the condensate, which makes the Hamiltonian for the Bogoliubov excitations inhomogeneous. The inhomogeneous Bogoliubov Hamiltonian is the starting point for a …
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Quantum Transport of Electronic Excitations through Macromolecules
The investigation of real-time dynamics of charged and neutral quantum excitation propagating through macromolecular systems is receiving growing attention due to its potentially countless applications in nano-scale (opto-)electronics and in biophysics. Several key issues have not been fully …
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Low Energy Excitations of 1D Fermi Gases
… using cold atom techniques and probe low-energy excitations in such systems. We do so using the technique of Bragg spectroscopy, which enables us to probe the dynamical structure factor of the system directly, which in turn tells us about the density-density and spin-density correlations in the …
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Hybridized Criticality and Elementary Excitations in LiHoF4
… a systematic framework for treating elementary excitations in this material across the phase diagram. These excitations interpolate between purely electronic, nuclear and lattice modes and exhibit two-types of quantum critical softening, both complete (as anticipated by elementary treatments, …
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Low-energy excitations in yttria-stabilized zirconia
… typical of glasses. The presence of glass-like excitations having a broad spectrum of energies is indicated by the quadratic temperature dependence of the thermal conductivity and the linear temperature dependence of the specific heat. Excitations with relaxation times on the order of 0.5 sec …
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Low-energy, localized excitations in amorphous polymers
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-20T20:03:53Z No. of bitstreams: 1 1980_matsumoto.pdf: 4103014 bytes, checksum: 0ca927dd0f785f97fb48332794b75f28 (MD5)
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Excitations in superfluids of atoms and polaritons
This thesis is devoted to the study of excitations in atomic and polariton Bose-Einstein condensates (BEC). These two specimens are prime examples for equilibrium and non equilibrium BEC. The corresponding condensate wave function of each system satisfies a particular partial differential equation …
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Nonlinear Analysis of Composite Beams under Random Excitations
<p>The vibration responses of three unsymmetrically laminated beams, that are excited with a Gaussian random forcing function, are studied in this thesis. The beams are analyzed nonlinearly and compared to linear results, indicating some important corrections. The solution procedure begins with the …
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Seismic isolation of buildings for vertical earthquake excitations
This thesis concerns a seismic isolation mechanism for vertical component of earthquake. The vertical component of earthquake can be stronger and more destructive than the horizontal component in near-fault areas, for instance, Christchurch earthquake in New Zealand in 2011 or Bam earthquake in …
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Internal Excitations of Stored Triatomic Hydrogen Molecular Ions
… which were used to monitor H3+ internal excitations at the ion storage ring TSR of the Max-Planck-Institut fuer Kernphysik; the Coulomb explosion imaging technique confirmed vibrational cooling due to spontaneous decay within 2s of storage, while DR fragment imaging measurements indicated …
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Redundancy in Steel Braced Frames Under Seismic Excitations
A new redundancy factor from probabilistic theory of performance evaluation is derived and determined for all of the calculated braced frames. The new redundancy factors are compared with the redundancy factors currently required by code. Fragility curves are also calculated for each building. …
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