论文标题
部分可观测时空混沌系统的无模型预测
Tunneling magnetoresistance and spin-valley polarization of aperiodic magnetic silicene superlattices
论文作者
论文摘要
磁性硅级别超晶格（MSSL）是具有自旋谷化和隧穿磁磁力（TMR）功能的多功能结构。然而，与超晶格周期性相关的振荡运输特性通过逆转磁化方向来阻碍稳定的自旋valley极化状态。在这里，我们表明，通过降低周期性MSSL（P-MSSL）的特征电导振荡，可以使用多个周期性来改善自旋谷极化和TMR。使用Landauer-Büttiker形式主义和转移矩阵方法，我们研究了fibonacci（F-）和Thue-Morse（TM-）MSSLS的自旋 - 瓦利极化和TMR，作为典型的aperiodic Superlattices。我们的发现表明，具有较高障碍的大型峰值可提供更好的自旋谷化极化和TMR值。特别是，与F-和P-MSSL相比，TM-MSSL大大降低了导致两个定义明确的自旋谷化态和更好的TMR的电导振荡。 F-MSSL还改善了自旋谷化极化和TMR，但是它们在很大程度上取决于超晶格生成的奇偶校验。
Magnetic silicene superlattices (MSSLs) are versatile structures with spin-valley polarization and tunneling magnetoresistance (TMR) capabilities. However, the oscillating transport properties related to the superlattice periodicity impede stable spin-valley polarization states reachable by reversing the magnetization direction. Here, we show that aperiodicity can be used to improve the spin-valley polarization and TMR by reducing the characteristic conductance oscillations of periodic MSSLs (P-MSSLs). Using the Landauer-Büttiker formalism and the transfer matrix method, we investigate the spin-valley polarization and the TMR of Fibonacci (F-) and Thue-Morse (TM-) MSSLs as typical aperiodic superlattices. Our findings indicate that aperiodic superlattices with higher disorder provide better spin-valley polarization and TMR values. In particular, TM-MSSLs reduce considerably the conductance oscillations giving rise to two well-defined spin-valley polarization states and a better TMR than F- and P-MSSLs. F-MSSLs also improve the spin-valley polarization and TMR, however they depend strongly on the parity of the superlattice generation.
