Electron Spin Dynamics in Semiconductors without Inversion Symmetry

We present a microscopic analysis of electron spin dynamics in the presence of an external magnetic field for non-centrosymmetric semiconductors in which the D'yakonov-Perel' spin-orbit interaction is the dominant spin relaxation mechanism. We implement a fully microscopic two-step calculation, in which the relaxation of orbital motion due to electron-bath coupling is the first step and spin relaxation due to spin-orbit coupling is the second step. On this basis, we derive a set of Bloch equations for spin with the relaxation times T_1 and T_2 obtained microscopically. We show that in bulk semiconductors without magnetic field, T_1 = T_2, whereas for a quantum well with a magnetic field applied along the growth direction T_1 = T_2/2 for any magnetic field strength.Comment: to appear in Proceedings of Mesoscopic Superconductivity and Spintronics (MS+S2002

Effective Management of Property of Enterprises and Organizations of Agro-Industrial Complex

In today's economic system, taking into account changing legislation and regulatory acts of great importance is given to the management of property objects, as of their affiliation to both legal and natural persons depends largely on their effectiveness and efficiency in general, as the subjects of the federation and at the state level. Therefore, timely analysis of facilities management property will coordinate and make timely adjustments to the use of all forms of ownership. DOI: 10.5901/mjss.2015.v6n3s7p19