Fractional band filling in an atomic chain structure
Fractional band filling in an atomic chain structure
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DOI：
10.1103/physrevlett.90.176805
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发表时间：
2003-05-02
影响因子：
8.6
通讯作者：
Himpsel, FJ
中科院分区：
文献类型：
--
作者：
Crain, JN;Kirakosian, A;Himpsel, FJ
在台阶Si（111）上发现了一种新的Au链状结构，它具有1/4填充带和一对大于或等于1/2填充带，它们的组合填充为4/3。用光电发射方法得到了Si（553）-Au的能带色散和费米面，并与Si（557）-Au的能带色散和费米面进行了比较。这两个系统的维数是使用紧约束拟合来确定的。分数带填充使得在强相关性存在的情况下保持金属丰度成为可能。
A new chain structure of Au is found on stepped Si(111) which exhibits a 1/4-filled band and a pair of greater than or equal to1/2-filled bands with a combined filling of 4/3. Band dispersions and Fermi surfaces for Si(553)-Au are obtained by photoemission and compared to that of Si(557)-Au. The dimensionality of both systems is determined using a tight binding fit. The fractional band filling makes it possible to preserve metallicity in the presence of strong correlations.