Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany.
Phys Rev Lett. 2012 Dec 28;109(26):266401. doi: 10.1103/PhysRevLett.109.266401. Epub 2012 Dec 26.
The mutual interplay between superlattice structures, band filling factors, and spin-orbit coupling results in a highly correlated electronic spin and charge state found for an array of atomic Pb wires grown on Si(557). By means of spin- and angle-resolved photoemission spectroscopy, the spin texture close to the Fermi surface was found to be alternating and equidistant; thus, Fermi nesting occurs in between bands with the same spin helicity, giving rise to spin-polarized charge-density waves in the direction across the wires. An out-of-phase superposition of both Rashba channels is manifested by an extraordinary large Rashba splitting of Δk0=0.2 Å(-1)=g/2, where g is a reciprocal lattice vector defined by the interwire distance and fits into the model of spin-density waves in antiferromagnetically ordered chain structures. The implications towards spin-polarized transport along the wires will be discussed.
在 Si(557) 上生长的一系列原子 Pb 线中，超晶格结构、能带填充因子和自旋轨道耦合之间的相互作用导致了一种高度关联的电子自旋和电荷态。通过自旋和角度分辨光发射谱，发现靠近费米面的自旋织构是交替且等距的；因此，在具有相同自旋螺旋性的能带之间发生费米嵌套，导致在沿这些线的方向上产生自旋极化的电荷密度波。两个 Rashba 通道的反相叠加表现为 Rashba 劈裂的异常大值 Δk0=0.2 Å(-1)=g/2，其中 g 是由线间距离定义的倒格矢，符合反铁磁有序链结构中自旋密度波的模型。这对沿这些线进行自旋极化输运的意义将进行讨论。
