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Polar caps during geomagnetic polarity reversals
(Wiley Blackwell Publishing, Inc, 2019-02)
Changes in the Earth’s magnetic field can deeply modify the polar caps and auroral zones, which are the regions of most frequent precipitation of energetic particles. The present field is characterized by a dominant dipole ...
Polarity effects in unsupported polar nanoribbons
(American Physical Society, 2013-05)
We analyze the characteristics of polarity in unsupported nanoribbons with zigzag edges, by a combination of analytic models, semiempirical Hartree-Fock simulations, and first-principles approach. We consider two materials ...
Influence of the polarization in grazing scattering of fast helium atoms from LiF(001) surfaces
(American Physical Society, 2008-12)
Grazing scattering of neutral atoms from insulator surfaces is investigated in the intermediate velocity range, in which interference effects have recently been observed. To describe this process we introduce a distortedwave ...
Computational study of Mn-doped GaN polar and non-polar surfaces
(Computational Materials Science, 2018)
Two-Electron-Spin Ratchets as a Platform for Microwave-Free Dynamic Nuclear Polarization of Arbitrary Material Targets
(American Chemical Society, 2019-04-18)
Optically pumped color centers in semiconductor powders can potentially induce high levels of nuclear spin polarization in surrounding solids or fluids at or near ambient conditions, but complications stemming from the ...
Polarization and transverse mode behaviour of VCSELs under optical injection
(Springer, 2006-03)
A theoretical analysis of the polarization and transverse modes of Vertical-cavity Surface-emitting lasers with external optical injection is performed. We show that, for single-mode operation, weak injection of linearly ...
Influence of the sign of the refractive index in the reflectivity of a metamaterial surface with localized roughness
(Springer, 2011-06)
To study the scattering properties of metamaterials, we generalize two scattering methods developed for conventional (non-magnetic) isotropic materials to the case of materials with arbitrary values (positive or negative) ...
Direct observation of surface polarization at hybrid perovskite/Au interfaces by dark transient experiments
(American Institute of Physics, 2020-05)
A distinctive feature of hybrid perovskite light-absorbing materials is the non-negligible ionic conductivity influencing photovoltaic performance and stability. Moving ions or vacancies can naturally accumulate at the ...
Influence of the injection current sweep rate on the polarization switching of vertical-cavity surface-emitting lasers
(American Institute of Physics, 2006-12)
We study the polarization switching of vertical-cavity surface-emitting lasers based on simulations of the spin-flip model. We show that the switching point depends on the ramp signal used to scan the injected current. ...