论文标题
由带弯曲和单轴应变诱导的抗铁磁性stanene纳米纤维中的完美光学自旋过滤
Perfect optical spin-filtering in antiferromagnetic stanene nanoribbons induced by band bending and uniaxial strain
论文作者
论文摘要
理论上在正常电场的组合效果和基于室温下的紧密结合模型的情况下，在理论上研究了抗磁性stanene纳米纤维的非平衡自旋偏振转运性能。由于Stanene晶格中存在自旋轨道耦合，因此应用正常的电场会导致在传导和价带中自旋分辨能级的带退化。此外，归因于抗铁磁交换场在两个山谷处的偏振光子的无效吸收导致不等的自旋光电流，用于旋转和旋转成分。有趣的是，在存在边缘电势引起的带弯曲的情况下，在入射光的更宽波长区域上发生了允许的量子效率。尤其重要的是，交换磁场的变化在弯曲带结构中产生自旋半导体行为。此外，可以表明，在单轴应变和狭窄的边缘电势的同时获得光学自旋过滤效果。
Non-equilibrium spin-polarized transport properties of antiferromagnetic stanene nanoribbons are theoretically studied under the combining effect of a normal electric field and linearly polarized irradiation based on the tight-binding model at room temperature. Due to the existence of spin-orbit coupling in stanene lattice, applying normal electric field leads to splitting of band degeneracy of spin-resolved energy levels in conduction and valence bands. Furthermore, unequivalent absorption of the polarized photons at two valleys which is attributed to an antiferromagnetic exchange field results in unequal spin-polarized photocurrent for spin-up and spin-down components. Interestingly, in the presence of band bending which has been induced by edge potentials, an allowable quantum efficiency occurs over a wider wavelength region of the incident light. It is especially important that the variation of an exchange magnetic field generates spin semi-conducting behavior in the bended band structure. Moreover, it is shown that optical spin-filtering effect is obtained under the simultaneous effect of uniaxial strain and narrow edge potential.
