15,056 research outputs found

    Investigation of in-plane nuclear field formation in single self-assembled quantum dots

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    We studied the formation mechanism of the in-plane nuclear field in single self-assembled In0.75_{0.75}Al0.25_{0.25}As/Al0.3_{0.3}Ga0.7_{0.7}As quantum dots. The Hanle curves with an anomalously large width and hysteretic behavior at the critical transverse magnetic field were observed in many single quantum dots grown in the same QD sample. In order to explain the anomalies in the Hanle curve indicating the formation of a large nuclear field perpendicular to the photo-injected electron spin polarization, we propose a new model based on the current phenomenological model for dynamic nuclear spin polarization. The model includes the effects of the nuclear quadrupole interaction and the sign inversion between in-plane and out-of-plane g-factors, and the model calculations reproduce successfully the characteristics of the observed anomalies in the Hanle curves.Comment: 7 pages, 6 figure

    Finite Anomalous Magnetic Moment in the Gauge-Higgs Unification

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    We show that the anomalous magnetic moment of fermion in the gauge-Higgs unification is finite in any spacetime dimensions, which is a new predictive physical observable similar to the Higgs mass.Comment: 12 pages, 2 eps files, final version to appear in PR

    Temperature dependence of the spin and orbital magnetization density in Sm1xGdxAl2Sm_{1-x}Gd_{x} Al_{2} around the spin-orbital compensation point

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    Non-resonant ferromagnetic x-ray diffraction has been used to separate the spin and orbital contribution to the magnetization density of the proposed zero-moment ferromagnet Sm0.982Gd0.018Al2Sm_{0.982}Gd_{0.018} Al_{2}. The alignment of the spin and orbital moments relative to the net magnetization shows a sign reversal at 84K, the compensation temperature. Below this temperature the orbital moment is larger than the spin moment, and vice versa above it. This result implies that the compensation mechanism is driven by the different temperature dependencies of the 4f4f spin and orbital moments. Specific heat data indicate that the system remains ferromagnetically ordered throughout

    Phenomenological Analysis of pppp and pˉp\bar{p}p Elastic Scattering Data in the Impact Parameter Space

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    We use an almost model-independent analytical parameterization for pppp and pˉp\bar{p}p elastic scattering data to analyze the eikonal, profile, and inelastic overlap functions in the impact parameter space. Error propagation in the fit parameters allows estimations of uncertainty regions, improving the geometrical description of the hadron-hadron interaction. Several predictions are shown and, in particular, the prediction for pppp inelastic overlap function at s=14\sqrt{s}=14 TeV shows the saturation of the Froissart-Martin bound at LHC energies.Comment: 15 pages, 16 figure