论文标题
通过使用应变梯度，硅在硅中隐藏自旋极化的实验证据
Experimental evidence of hidden spin polarization in silicon by using strain gradient
论文作者
论文摘要
具有隐藏自旋极化的中心对称材料被认为是实现节能旋转系统和设备的有前途的候选者。但是，对隐藏自旋极化和由此产生的运输行为的控制尚不清楚。我们假设不均匀应变可能是研究和控制隐藏自旋极化的外部旋钮。在这项工作中，我们演示了应变梯度介导的对称性破裂，以发现中心对称SI晶格中的隐藏自旋极化。隐藏的自旋极化产生了沿Si中<111>方向的磁晶的各向异性和局部磁矩。局部磁矩会产生自旋声音声子耦合，这是N-SI和P-SI观察到的自旋壁效应的根本原因。 SI中隐藏的磁矩的发现不仅挑战了对磁性起源的基本理解，而且还带来了旋转系统实现的巨大飞跃。
The centrosymmetric materials with hidden spin polarization are considered to be the promising candidates for realization of energy efficient spintronics systems and devices. However, the control of hidden spin polarization and resulting transport behavior is not well understood. We hypothesized that inhomogeneous strain can be the external knob to study and control hidden spin polarization. In this work, we demonstrate a strain gradient mediated symmetry breaking to discover the hidden spin polarization in centrosymmetric Si lattice. The hidden spin polarization gives rise to magnetocrystalline anisotropy and local magnetic moment along <111> directions in the Si. The local magnetic moment gives rise to spin-acoustic phonon coupling, which is the underlying cause of observed spin-Hall effect in both n-Si and p-Si. Discovery of hidden magnetic moment in Si not only challenges the fundamental understanding of the origin of the magnetism but also presents a giant leap in realization of spintronics systems.
