Anisotropy of spin relaxation in metals.
Anisotropy of spin relaxation in metals.
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DOI：
10.1103/physrevlett.109.236603
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发表时间：
2012-10
影响因子：
8.6
通讯作者：
B. Zimmermann;P. Mavropoulos;S. Heers;N. H. Long;S. Blügel;Y. Mokrousov
中科院分区：
文献类型：
--
作者：
B. Zimmermann;P. Mavropoulos;S. Heers;N. H. Long;S. Blügel;Y. Mokrousov
引入了自旋弛豫各向异性的概念，即自旋弛豫各向异性与注入电子的自旋方向有关。该效应与Elliott-Yafet参数的各向异性有关，该各向异性是由于自旋量子化轴变化时自旋轨道哈密顿量分解成自旋守恒项和自旋翻转项的调制而产生的。这种各向异性，对于单轴过渡金属达到巨大的值（例如，830%的hcp Hf）的密度泛函计算显示，是有关的扩展的“自旋翻转热区”的费米表面上创建的扩展的表面片，或“自旋翻转热环”在布里渊区边界附近，并没有理论上限。简要概述了测量效果的可能方法以及应用中的后果。
The concept of anisotropy of spin relaxation in nonmagnetic metals with respect to the spin direction of the injected electrons relative to the crystal orientation is introduced. The effect is related to an anisotropy of the Elliott-Yafet parameter, arising from a modulation of the decomposition of the spin-orbit Hamiltonian into spin-conserving and spin-flip terms as the spin quantization axis is varied. This anisotropy, reaching gigantic values for uniaxial transition metals (e.g., 830% for hcp Hf) as density-functional calculations show, is related to extended "spin-flip hot areas" on the Fermi surface created by the proximity of extended sheets of the surface, or "spin-flip hot loops" at the Brillouin zone boundary, and has no theoretical upper limit. Possible ways of measuring the effect as well as consequences in application are briefly outlined.