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European Quantum Electronics Conference (EQEC)

Atom optical properties of magnetic components

Frank Lison, D. Haubrich, P. Schuh, R. Wynands, Dieter Meschede

Published Aug 24, 2005• 0 citations
Publisher
DOI
10.1109/eqec.1998.714931

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•Mar 1, 2008•0 citations
this paper studied the magnetic field effect on optical properties in a closed lambda-type three level atomic system. Two circularly polarized components are interacted separately by two transitions of this medium. By numerically solving the density matrix equations for this system, it is demonstrated that the optical properties of system, such as absorption, dispersion and lasing, can be controlled via switching on and off an external magnetic field. The proposed scheme may have applications in the design of magneto-optic switching devices. Also the time dependent behavior of the absorption curve in the presence of magnetic field and incoherent pumping field investigated.
We study the finite-temperature properties of two-component fermionic atoms trapped in a two-dimensional (2D) optical lattice. We apply the self-energy functional approach to the 2D Hubbard model with a harmonic-trapping potential, and systematically investigate the thermodynamic properties of this system. We find that entropy and grand potential provide evidence of a crossover between the Mott-insulating and the metallic phases at certain temperatures. In addition, we find that entropy exhibits a cusplike anomaly at lower temperatures, suggesting a second- or higher-order antiferromagnetic transition. We estimate the antiferromagnetic transition temperatures, and clarify how the trapping potential affects this magnetic transition.
This thesis reports on the progress made towards the integration of fibre optics components for the atom chip, a device developed to manipulate matter on the atomic scale for the purpose of quantum information processing, novel applications, and fundamental research. Following in the direction of the electronics industry, miniaturisation has resulted in exquisite control of cold atoms above surfaces, allowing the vision of a matter wave toolbox to come closer to fruition. However, although the size of the components necessary for guiding atoms via magnetic or electrostatic fields has been greatly reduced, there is still a need to scale down the optical components. The development of these cavities is detailed in this thesis, from early use of evaporated gold coated mirrors to the fully integral solution of photorefractive Bragg gratings. In addition to a thorough analysis of the optical properties of these fibre gap cavities, experimental results indicate that these gap cavity devices can be constructed with the sensitivity necessary for single atom detection.