基于第一性原理的相对论自旋-晶格耦合Angular momentum转移
Angular momentum transfer via relativistic spin-lattice coupling from first principles
摘要：
角动量的转移和控制是自旋电子学应用的一个关键方面。直到最近，才有研究表明，在超短时间尺度上，角动量从自旋系统转移到晶格是可能的。为了有助于理解自旋和晶格自由度之间的角动量转移，我们提出了一个从第一性原理计算完全相对论性自旋-晶格耦合参数的方案。通过在同一水平上处理自旋组态和原子位置的变化，原子自旋-晶格耦合参数的封闭表达式可以以相干的方式导出到任何顺序。分析这些参数的性质，特别是它们对自旋轨道耦合的依赖，我们发现，即使在bcc Fe的自旋系统和晶格之间的角动量交换的主导项是一个Dzyaloshiskii-Moriya型相互作用，这是由于对称性破缺扭曲的晶格。
英文摘要：
The transfer and control of angular momentum is a key aspect for spintronic applications. Only recently, it was shown that it is possible to transfer angular momentum from the spin system to the lattice on ultrashort time scales. In an attempt to contribute to the understanding of angular momentum transfer between spin and lattice degrees of freedom we present a scheme to calculate fully-relativistic spin-lattice coupling parameters from first-principles. By treating changes in the spin configuration and atomic positions at the same level, closed expressions for the atomic spin-lattice coupling parameters can be derived in a coherent manner up to any order. Analyzing the properties of these parameters, in particular their dependence on spin-orbit coupling, we find that even in bcc Fe the leading term for the angular momentum exchange between the spin system and the lattice is a Dzyaloshiskii-Moriya-type interaction, which is due to the symmetry breaking distortion of the lattice.
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