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arXiv 1301.4354cond-mat.mes-hall
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非磁性Ag/Ru(0001)正常发射时的价带圆二色性

Valence Band Circular Dichroism in non-magnetic Ag/Ru(0001) at normal emission

Arantzazu Mascaraque, T. Onur Menteş, Kevin F. McCarty, Jose F. Marco, Andreas K. Schmid, Andrea Locatelli, Juan de la Figuera

摘要:

对于Ru(0001)上的Ag膜的非磁性系统,我们已经测量了沿表面法线发射的光电子的圆二色性,光电子发射电子显微镜(PEEM)中通常使用的几何形状。光电子能谱从微米级的区域具有均匀的厚度Ag膜上的一个单一的,原子级平坦的Ru平台。对于一个单一的银层,我们发现一个圆二色性,超过6%的d-衍生带区域周围4.5 eV的结合能。二向色性随着Ag膜厚度增加到三个原子层而减小。我们讨论的对称性降低,甚至可以发生在正常发射的圆二色性的起源。

英文摘要:

For the non-magnetic system of Ag films on Ru(0001), we have measured the circular dichroism of photoelectrons emitted along the surface normal, the geometry typically used in photoemission electron microscopy (PEEM). Photoemission spectra were acquired from micrometer-sized regions having uniformly thick Ag films on a single, atomically flat Ru terrace. For a single Ag layer, we find a circular dichroism that exceeds 6% at the d-derived band region around 4.5 eV binding energy. The dichroism decreases as the Ag film thickness increases to three atomic layers. We discuss the origin of the circular dichroism in terms of the symmetry lowering that can occur even in normal emission.

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