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M.B.E. growth on GaAs (001) patterned substratesWilliams, Richard Spencer January 2003 (has links)
No description available.
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Fermi surface nesting and premartensitic phenomena in the shape-memory alloys Ni₂MnGa and Ni₀.₆₂A1₀.₃₈Watts, Robert John January 2005 (has links)
No description available.
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Chaotic Hamiltonian quantum ratchets and filters with cold atoms in optical lattices : properties of Floquet statesHur, Gwang-Ok January 2006 (has links)
No description available.
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Computational simulations of titanatesJennings, Vincent Louis January 2002 (has links)
No description available.
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On advances in the kernel and functionality of ab initio electronic-structure calculationsRayson, Mark James January 2005 (has links)
No description available.
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Lattice Boltzmann simulations of acoustic streaming and the radiation force on objects in a sound fieldHaydock, David January 2004 (has links)
No description available.
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Strongly correlated one-dimensional systems of cold atoms in optical latticesClark, Stephen Richard James Franz January 2007 (has links)
No description available.
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Mesoscopic modelling of nematic emulsionsSulaiman, Nidhal A. January 2006 (has links)
No description available.
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Orbital ordering in the layered manganitesBeale, Thomas ?. W. January 2006 (has links)
The interaction between the long range correlations of electrons and the encompassing crystal structure is a key aspect of solid state physics. This thesis studies the long range interactions of the 3D orbitals in the single and bilayered manganites. Orbital ordering and the omnipresent Jahu-Teller distortions appear at low temperatures ill these samples, accompanied by a real-space charge order. The results display different aspects of these long range order phenomena ill Lao.5Sr1.5nO4, Nd1_xSr1+xMn04 where 0.66 >x >0.8, and La2_2x:Sr1+2xMn207where 0.5 > x > 0.7 using different techniques of x-ray diffraction. High energy x-ray diffraction is optimised to detect structural aspects ill materials, and as Audi is sensitive to the Jalm-Teller distortions. Resonant scattering at the Mil к edge is used to study both the structural and the more specific charge and orbital ordering. Finally, soft x-ray resonant diffraction at the Mn L edge is used as a specialised technique for looking at the magnetic and orbital ordering. A small crystal field distortion irt always observed to be present ill the orbitally ordered materials, however the size of the distortion is very large in the single layer Lao.5Sr1.5MnO4aud very small ill the bilayer LaSr2Mn207. Despite this, orbital ordering is observed in both materials. Combining experimental data with theoretical models, suggests that integer charge ordering occurs oil the MnO6 octahedra in both materials within the orbitally ordered regime.
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A C02 laser lattice experiment for cold atomsWeatherill, Kevin J. January 2007 (has links)
This thesis presents work on a laser cooling experiment designed for trapping Rb atoms in a CO(_2) laser optical trap. Some emphasis is placed on experimental features designed to allow the future implementation of a neutral atom quantum computation scheme. The experiment was built from scratch and includes the development of stable and reliable lasers for laser cooling and the construction of a double-chamber ultra-high vacuum system. The construction of a magneto-optical trap and optical molasses are discussed and results presented. The search for a signature of atoms trapped in the CO(_2) laser optical trap is described but so far no such signature has been observed. Possible reasons for this difficulty are presented Numerical modeling of the optical potential expected from the CO(_2) laser lattice has been performed and the expected experimental parameters of trap depth and oscillation frequency deduced from them.
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