Electrons seen in orbit

Secondary electrons and positrons in near earth orbit

The secondary e + and e − populations in near earth's orbit have been calculated by simulation. The results are in very good agreement with the recent AMS measurements. The e + over e − flux ratio for particles below the geomagnetic cutoff appears to be due to the geomagnetic East-West effect. The study of particle populations in the earth environment has been a field of intense research activi...

Role of the spin-orbit interaction in elastic scattering of electrons in quantum wells

We present a theoretical study of the spin-dependent electron scattering from screened impurities in III–V semiconductor quantum wells. The effective one band Hamiltonian and the Rashba spin-orbit interaction are used. We calculated the Mott scattering cross-section and the Sherman function for two-dimensional electrons spin-polarized parallel to the z-axis (direction of structure growth). We h...

Investigation of spin-orbit effects in the excitation of noble gases by spin-polarized electrons.

Chiral-like tunneling of electrons in two-dimensional semiconductors with Rashba spin-orbit coupling

The unusual tunneling effects of massless chiral fermions (mCF) and massive chiral fermions (MCF) in a single layer graphene and bilayer graphene represent some of the most bizarre quantum transport phenomena in condensed matter system. Here we show that in a two-dimensional semiconductor with Rashba spin-orbit coupling (R2DEG), the real-spin chiral-like tunneling of electrons at normal inciden...

Columbia Hills, Mars: Aeolian features seen from the ground and orbit

[1] Abundant wind-related features occur along Spirit’s traverse into the Columbia Hills over the basaltic plains of Gusev Crater. Most of the windblown sands are probably derived from weathering of rocks within the crater, and possibly from deposits associated with Ma’adim Vallis. Windblown particles act as agents of abrasion, forming ventifacts, and are organized in places into various bed fo...