A pr 1 99 9 Accuracy of a mechanical single electron

ar X iv : m at h - ph / 9 90 40 04 v 1 6 A pr 1 99 9 Heisenberg Groups in the Theory of the Lattice Peierls Electron : the Irrational Flux Case

ar X iv : h ep - p h / 99 03 26 4 v 2 8 A pr 1 99 9 INT # DOE / ER / 40561 - 49 Low - Energy Parity - Violation and New Physics

The new physics sensitivity of a variety of low-energy parity-violating (PV) observables is analyzed. A comparison is made between atomic PV for a single isotope, atomic PV using isotope ratios, and PV electron-hadron and electron-electron scattering. The complementarity among these observables, as well as with high-energy processes, is emphasized. Theoretical uncertainties entering the interpr...

ar X iv : c on d - m at / 9 60 40 23 v 1 3 A pr 1 99 6 Excitons of Composite Fermions

The low-energy excitations of filled Landau levels (LL's) of electrons involve promotion of a single electron from the topmost filled LL to the lowest empty LL. These are called excitons or collective modes. The incompress-ible fractional quantum Hall states are understood as filled LL's of composite fermions, and the low-energy neutral excitations are excitons of composite fermions. New techni...

1 3 A pr 1 99 9 Electrodynamics of Nd 0 . 7 Sr 0 . 3 MnO 3 Single Crystal investigated by Optical Conductivity Analyses

We investigated temperature dependent optical conductivity spectra of Nd0.7Sr0.3MnO3 single crystal. We found that polishing and surface scattering effects on the Nd0.7Sr0.3MnO3 crystal surfaces could significantly distort the optical responses, especially in the mid-infrared region. However, oxygen annealing and gold normalization processes seemed to remedy the distortions. We found that the s...

ua nt - p h / 99 04 10 2 v 1 2 9 A pr 1 99 9 Semiclassical dynamics of a spin - 12 in an arbitrary magnetic field

The spin coherent state path integral describing the dynamics of a spin-12system in a magnetic field of arbitrary time-dependence is considered. Defining the path integral as the limit of a Wiener regularized expression, the semiclassical approximation leads to a continuous minimal action path with jumps at the endpoints. The resulting semiclassical propagator is shown to coincide with the exac...