Bulletin of the American Physical Society
2007 APS Four Corners Section/SPS Zone 16 Joint Fall Meeting
Volume 52, Number 14
Friday–Saturday, October 19–20, 2007; Flagstaff, Arizona
Session B2: Condensed Matter: General Theory |
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Chair: William Evenson, Utah Valley State College Room: Chemistry (Bldg. 20) Room 225 |
Friday, October 19, 2007 2:10PM - 2:22PM |
B2.00001: Open Systems and the Millikan Oil-Drop Experiment Steven Valone When subsystems interact sufficiently, the subsystems can exchange electrons and the effective number of electrons on each subsystem can take on fractional values. The energy of the system can be expressed as a function of that fractional charge. Pioneering work of Perdew, Parr, Levy, and Balduz [1] showed that when the subsystems interact weakly, the energy depends linearly with the fractional charge. We explain recently derived energy dependencies, based on a 2-state model, for the case when the subsystems interact strongly [2]. Those results are extended to a more general 3-state case. Insights into the properties of the chemical potential of the subsystems is discussed. The show how the Millikan oil-drop experiment an open-system DFT are consistent. \newline \newline [1] J.~P.~Perdew, R.~G.~Parr, M.~Levy, and J.~L.~Balduz, Jr., Phys.~Rev.~Lett.~{\bf 49}, 1691 (1982). \newline [2] S.~M.~Valone and S.~R.~Atlas, Phys.~Rev.~Lett.~{\bf 97}, 256402 (2006). [Preview Abstract] |
Friday, October 19, 2007 2:22PM - 2:34PM |
B2.00002: Nonlinear Scattering of BECs on a Finite Barrier Rachel R. Miller, Matthew S. Heller, Lincoln D. Carr We consider the scattering of a Bose-Einstein condensate (BEC) on a finite barrier. The nonlinear Schr\"{o}dinger equation (NLS) models the mean field of a BEC. Analytic stationary state solutions to the NLS can be found for the case of piecewise constant potential. We present these solutions in closed analytic form, as well as density and transmission plots for several physical cases. This study is directly applicable to an atom laser, as well as many other physical systems described by the NLS. [Preview Abstract] |
Friday, October 19, 2007 2:34PM - 2:46PM |
B2.00003: Many-body treatment of quantum transport through single molecules Justin Bergfield, Charles Stafford Electron transport through single molecules represents a natural evolution of {\em mesoscopic physics} to the ultimate limit of smallness. An important respect in which single-molecule devices differ from mesoscopic systems is that molecules possess {\em exact spatial symmetries}, which are manifested in their quantum transport properties. In this talk, we investigate the effect of molecular symmetries on multiterminal quantum transport through single benzene molecules, treating the lead-molecule couplings perturbatively via a Dyson expansion, but including intramolecular correlations exactly using the nonequilibrium Green function approach. It has become increasingly clear that an accurate treatment of intramolecular correlations is necessary to provide a realistic model of electron transport through single molecules, and hence to achieve quantitative agreement with conductance experiments. [Preview Abstract] |
Friday, October 19, 2007 2:46PM - 2:58PM |
B2.00004: Persistent Spin Helix Propagators Bailey Hsu, Jean-Francois Van Huele Extensive spintronics work is aimed at achieving high computational speed. Spin coherence is desired in quantum computation. However, spin-orbit coupling which dominates the dynamics in spintronics may lead to spin decoherence. In this talk, we will briefly introduce a class of spin-orbit systems a.k.a Persistent Spin Helix which can lead in principle to infinite spin lifetime. We will analyze the behavior using the quantum propagator formalism. [Preview Abstract] |
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