Electronic structure study of ultrathin Ag(111) films modified by a Si(111) substrate and √<3>×√<3>-Ag2Bi surface
Electronic structure study of ultrathin Ag(111) films modified by a Si(111) substrate and √<3>×√<3>-Ag2Bi surface
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Si(111)衬底和√<3>×√<3>-Ag2Bi表面修饰的超薄Ag(111)薄膜的电子结构研究
DOI：
10.1088/0953-8984/24/11/115501
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
I.Matsuda
中科院分区：
文献类型：
--
作者：
M.Ogawa;P.M.Sheverdyaeva;P.Moras;D.Topwal;A.Harasawa;K.Kobayashi;C.Carbone;I.Matsuda
角分辨光电子能谱实验表明，在Si（111）衬底上生长的Ag（111）薄膜的电子结构被{radical}3 Multiplication-Sign {radical}3- Ag{sub 2}Bi Rashba型表面合金的形成所显著扰动。四个自旋分裂的表面状态，具有不同的能带色散和能量轮廓，拦截和杂交选择性地与SP衍生的量子阱态的Ag层。详细的二维能带映射的系统进行和恒定的能量轮廓在不同的能量导致六角形，星星和花状扭曲的量子阱态作为一个结果的各种相互作用。进一步的波状调制膜的电子结构被发现起源于umklapp反射的Ag膜状态根据表面周期性。（文件）
Angle-resolved photoemission spectroscopy experiments show that the electronic structure of a Ag(111) film grown on Si(111) is markedly perturbed by the formation of a {radical}3 Multiplication-Sign {radical}3- Ag{sub 2}Bi Rashba-type surface alloy. Four spin-split surface states, with different band dispersions and energy contours, intercept and hybridize selectively with the sp-derived quantum well states of the Ag layer. Detailed two-dimensional band mapping of the system was carried out and constant energy contours at different energies result in hexagonal-, star- and flower-like distortions of the quantum well states as a result of various interactions. Further wavy-like modulations of the electronic structure of the film are found to originate from umklapp reflections of the Ag film states according to the surface periodicity. (paper)