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arXiv 0807.2142cond-mat.mtrl-scicond-mat.dis-nn
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二维自旋轨道耦合系统中的电场诱导自旋激发

Electric-field induced spin excitations in two-dimensional spin-orbit coupled systems

P. Kleinert, V. V. Bryksin

摘要:

严格耦合的自旋-电荷漂移扩散方程来自自旋-密度矩阵的量子动力学方程,该方程包含由于k-线性自旋-轨道相互作用、面内电场和在非磁性杂质上的弹性散射的影响。感应磁化强度的显式解析解具有极结构,由此确定了自旋激发的色散关系。一般方法的应用是指长寿命的场诱导自旋波的光产生的自旋和电荷图案的激发。这种方法将空间电荷波物理学中已知的方法转移到自旋本征模的处理上。此外,振荡电场的放大由自旋注入证明。

英文摘要:

Rigorous coupled spin-charge drift-diffusion equations are derived from quantum-kinetic equations for the spin-density matrix that incorporate effects due to k-linear spin-orbit interaction, an in-plane electric field, and the elastic scattering on nonmagnetic impurities. The explicit analytical solution for the induced magnetization exhibits a pole structure, from which the dispersion relations of spin excitations are identified. Applications of the general approach refer to the excitation of long-lived field-induced spin waves by optically generated spin and charge patterns. This approach transfers methods known in the physics of space-charge waves to the treatment of spin eigenmodes. In addition, the amplification of an oscillating electric field by spin injection is demonstrated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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