Modification of surface electronic properties on alloy surfaces: Standing waves on a Cu- 9 at . % Al ( 111 ) surface observed by STM
Modification of surface electronic properties on alloy surfaces: Standing waves on a Cu- 9 at . % Al ( 111 ) surface observed by STM
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改性%20of%20surface%20Electronic%20properties%20on%20alloy%20surfaces:%20Standing%20waves%20on%20a%20Cu-%209%20at%20.%20%%20Al%20(%20111%20)%20surface%
DOI：
10.1103/physrevb.79.235427
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发表时间：
2009
影响因子：
3.7
通讯作者：
D. Fujita
中科院分区：
文献类型：
--
作者：
Yinghui Yu;K. Sagisaka;D. Fujita
$\text{Cu-}9\text{}\text{at}\text{表面电子结构的直接实空间研究{\text{}%\text{}\text{Al}(111)$合金表面采用低温扫描隧道显微镜观察。$\text{Cu-}9\text{}\text{at}\text{的驻波。利用差分电导映射法对控制退火温度得到的曲面进行了观察，得到了{\ text{}%\text{}\text{Al}(111)\text{\ensuremath{-}}(1\ifmmode\times\else\texttimes\fi{}1)$和$(\sqrt{3}\ifmmode\times\else\texttimes\fi{}}\sqrt{3})R30\ifmmode^\circ\else\textdegree\fi{}$。由铝原子偏析引起的表面缺陷充当静态散射中心，以维持驻波的形成。对驻波的分析表明，两个表面的肖克利表面态的能量显著向下移动。这种转变可以用表面电子的强再分配来解释。
A direct and real-space study of the surface electronic structure on $\text{Cu-}9\text{ }\text{at}\text{.}\text{ }%\text{ }\text{Al}(111)$ alloy surfaces was performed using low-temperature scanning tunneling microscopy. The standing waves on $\text{Cu-}9\text{ }\text{at}\text{.}\text{ }%\text{ }\text{Al}(111)\text{\ensuremath{-}}(1\ifmmode\times\else\texttimes\fi{}1)$ and $(\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3})R30\ifmmode^\circ\else\textdegree\fi{}$ surfaces, which were obtained by controlling annealing temperature, were observed by differential-conductance mapping. Surface imperfection caused by segregation of aluminum atoms acted as static scattering centers in order to sustain the standing-wave formation. An analysis of the standing waves revealed a significant downward energy shift of the Shockley surface states on both surfaces. This shift is explained in terms of the strong redistribution of the surface electrons.