Scattering of surface states at step edges in nanostripe arrays.
Scattering of surface states at step edges in nanostripe arrays.
复制标题
纳米带阵列阶梯边缘处表面态的散射。
DOI：
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发表时间：
2005
影响因子：
8.6
通讯作者：
J. Ortega
中科院分区：
文献类型：
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作者：
F. Schiller;M. Ruiz;J. Cordón;J. Ortega
在阶梯状银/铜纳米条阵列中，贵金属表面的表面态分裂为类银和类铜两个亚带。后者通过在邻近的铜(111)上沉积银而自组装。类银态在裸露的台阶边缘以银条的形式分散，导致了umclapp带、量子尺寸效应和峰的加宽。相反，对于类铜态，银条带界变得透明，表现出与平坦的铜(111)一样的能带弥散。我们发现量子尺寸移动与峰值展宽之间存在线性关系，这种关系适用于各种阶梯体系，揭示了阶梯势垒的复杂性。
Surface states of noble metal surfaces split into Ag-like and Cu-like subbands in stepped Ag/Cu nanostripe arrays. The latter self-assemble by depositing Ag on vicinal Cu(111). Ag-like states scatter at nude step edges in Ag stripes, leading to umklapp bands, quantum size effects, and peak broadening. By contrast, Ag stripe boundaries become transparent to Cu-like states, which display band dispersion as in flat Cu(111). We find a linear relationship between the quantum size shift and peak broadening that applies in a variety of stepped systems, revealing the complex nature of step barrier potentials.