Spin polarized electron-positron pair production via elliptical polarized laser fields

Electron-positron pair production by photons in nonuniform strong fields.

A probability of electron-positron pair production by photons in strong nonuniform fields is derived by applying a model trajectory method in the frame of a semiclassical approach. In addition to the well known invariant field parameter chi, a new invariant parameter nu is introduced to characterize the nonuniformity of the field. For nu>>1, the obtained expression is reduced to the uniform-fie...

Local electron-electron interaction strength in ferromagnetic nickel determined by spin-polarized positron annihilation

We employ a positron annihilation technique, the spin-polarized two-dimensional angular correlation of annihilation radiation (2D-ACAR), to measure the spin-difference spectra of ferromagnetic nickel. The experimental data are compared with the theoretical results obtained within a combination of the local spin density approximation (LSDA) and the many-body dynamical mean-field theory (DMFT). W...

Erratum: Local electron-electron interaction strength in ferromagnetic nickel determined by spin-polarized positron annihilation

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Spin-polarized photoemission CY653 Electron Spectroscopy

Spin-polarized electron tunneling across magnetic dielectric

This letter deals with a magnetic tunnel junction having spin filtering by a magnetic barrier. We performed experiments in which a relatively strong external field rotates magnetizations of both ferromagnetic electrodes in the tunnel junction with the magnetic barrier simultaneously so that the two are always parallel to each other. The tunnel magnetoresistance induced in this way was over 16% ...