Razzoli E, Jaouen T, Mottas M-L, Hildebrand B, Monney G, Pisoni A, Muff S, Fanciulli M, Plumb N C, Rogalev V A, Strocov V N, Mesot J, Shi M, Dil J H, Beck H, Aebi P
Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, CH-1700 Fribourg, Switzerland.
Laboratory of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
Phys Rev Lett. 2017 Feb 24;118(8):086402. doi: 10.1103/PhysRevLett.118.086402. Epub 2017 Feb 22.
Spin- and angle-resolved photoemission spectroscopy is used to reveal that a large spin polarization is observable in the bulk centrosymmetric transition metal dichalcogenide MoS_{2}. It is found that the measured spin polarization can be reversed by changing the handedness of incident circularly polarized light. Calculations based on a three-step model of photoemission show that the valley and layer-locked spin-polarized electronic states can be selectively addressed by circularly polarized light, therefore providing a novel route to probe these hidden spin-polarized states in inversion-symmetric systems as predicted by Zhang et al. [Nat. Phys. 10, 387 (2014).NPAHAX1745-247310.1038/nphys2933].
自旋和角分辨光电子能谱被用于揭示在体心对称过渡金属二硫化物MoS₂中可观察到较大的自旋极化。研究发现，通过改变入射圆偏振光的旋向，可以反转测量到的自旋极化。基于光电子发射三步模型的计算表明，圆偏振光可以选择性地激发谷和层锁定的自旋极化电子态，因此为探测张等人[《自然·物理学》10, 387 (2014年)。NPAHAX1745 - 247310.1038/nphys2933]所预测的反演对称系统中的这些隐藏自旋极化态提供了一条新途径。
