36 research outputs found
Spin dynamics in semiconductors
This article reviews the current status of spin dynamics in semiconductors
which has achieved a lot of progress in the past years due to the fast growing
field of semiconductor spintronics. The primary focus is the theoretical and
experimental developments of spin relaxation and dephasing in both spin
precession in time domain and spin diffusion and transport in spacial domain. A
fully microscopic many-body investigation on spin dynamics based on the kinetic
spin Bloch equation approach is reviewed comprehensively.Comment: a review article with 193 pages and 1103 references. To be published
in Physics Reports
First-principle study of the electronic structures and ferroelectric properties in BaZnF 4
The electronic structures and ferroelectric properties of barium fluoride
BaZnF4 were investigated by employing ab initio calculations based on the
density-functional theory within generalized gradient approximation. We
discussed the possible origin of ferroelectricity of BaZnF4 by the
analysis of Born effective charges, orbital-resolved density of states, and
distribution of charge density. The results show that the barium and
fluorine atoms are very important polarization unity. The calculated
spontaneous polarization of 14.2Â ÎŒC/cm2 by using Berry-phase approach
is reasonable agreement with previous experimental data. Barium fluorides
are promising candidates for use in nonvolatile memories devices