论文标题
rashba耦合和旋转切换穿过狄拉克半金属的表面状态
Rashba coupling and spin switching through surface states of Dirac semimetals
论文作者
论文摘要
我们研究了Rashba自旋轨道耦合对拓扑狄拉克半法的费米弧的影响。 RASHBA耦合是通过打破表面的反转对称性来诱导的。值得注意的是，通过与基板的相互作用并通过外部电场控制，可以增强这种耦合。我们通过分析和数值研究表面状态的自旋旋转，这是电子动量和耦合强度的函数。此外，对自旋依赖性的两端电导的详细分析在清洁极限和添加杂质的随机分布中介绍。根据哈密顿量中二次术语的大小，自旋叉电导可能会占主导地位，因此显示了系统对自旋应用的潜力，因为即使在存在障碍的情况下，效果也很强。
We study the effect of the Rashba spin-orbit coupling on the Fermi arcs of topological Dirac semimetals. The Rashba coupling is induced by breaking the inversion symmetry at the surface. Remarkably, this coupling could be enhanced by the interaction with the substrate and controlled by an external electric field. We study analytically and numerically the rotation of the spin of the surface states as a function of the electron's momentum and the coupling strength. Furthermore, a detailed analysis of the spin-dependent two-terminal conductance is presented in the clean limit and with the addition of a random distribution of impurities. Depending on the magnitude of the quadratic terms in the Hamiltonian, the spin-flip conductance may become dominant, thus showing the potential of the system for spintronic applications, since the effect is robust even in the presence of disorder.
