Nonlocal Effects on Magnetism in the Diluted Magnetic Semiconductor Ga1−xMnxAs

作     者：Unjong Yu Abdol-Madjid Nili Karlis Mikelsons Brian Moritz Juana Moreno Mark Jarrell 

作者机构：Department of Physics and Astronomy & Center for Computation and Technology Louisiana State University Baton Rouge Louisiana 70803 USA Department of Applied Physics Gwangju Institute of Science and Technology Gwangju 500-712 Korea Department of Physics University of Cincinnati Cincinnati Ohio 45221 USA Stanford Institute for Materials and Energy Science SLAC National Accelerator Laboratory and Stanford University Stanford California 94305 USA 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2010年第104卷第3期

页      面：037201-037201页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：National Science Foundation, NSF, (0548011, 0706379, 0730290) National Science Foundation, NSF 

主　　题：Temperature 

摘      要：The magnetic properties of the diluted magnetic semiconductor Ga1−xMnxAs are studied within the dynamical cluster approximation. We use the k·p Hamiltonian to describe the electronic structure of GaAs with spin-orbit coupling and strain effects. We show that nonlocal effects are essential for explaining the experimentally observed transition temperature and saturation magnetization. We also demonstrate that the cluster anisotropy is very strong and induces rotational frustration and a cube-edge direction magnetic anisotropy at low temperature. With this, we explain the temperature-driven spin reorientation in this system.