Agency Fact Sheet, Law Enforcement Academy, FY2004

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Parity violation in Aharonov-Bohm systems: The spontaneous Hall effect

We show how macroscopic manifestations of P (and T) symmetry breaking can arise in a simple system subject to Aharonov-Bohm interactions. Specifically, we study the conductivity of a gas of charged particles moving through a dilute array of flux tubes. The interaction of the electrons with the flux tubes is taken to be of a purely Aharonov-Bohm type. We find that the system exhibits a nonzero transverse conductivity, i.e., a spontaneous Hall effect. This is in contrast to the fact that the cross sections for both scattering and bremsstrahlung (soft-photon emission) of a single electron from a flux tube are invariant under reflections. We argue that the asymmetry in the conductivity coefficients arises from many-body effects. On the other hand, the transverse conductivity has the same dependence on universal constants that appears in the quantum Hall effect, a result that we relate to the validity of the mean-field approximation.

Agency Fact Sheet, Iowa Lottery, FY2004

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Agency Fact Sheet, Department of Management, FY2004

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Agency Fact Sheet, Department of Natural Resource, FY2004

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Agency Fact Sheet, Iowa Parole Board, FY2004

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Agency Fact Sheet, PERB, FY2004

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Agency Fact Sheet, Department of Public Defense, FY2004

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Agency Fact Sheet, Department of Public Health, FY2004

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Agency Fact Sheet, Department of Public Safety, FY2004

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Agency Fact Sheet, Department of Revenue and Finance, FY2004

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Agency Fact Sheet, Secretary of State, FY2004

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Agency Fact Sheet, State of Iowa, FY2004

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Agency Fact Sheet, Department of Transportation, FY2004

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Agency Fact Sheet, Department of Treasurer, FY2004

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