One-dimensional versus two-dimensional surface states on stepped Au(111)

One-dimensional versus two-dimensional surface states on stepped Au(111)
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阶梯 Au(111) 上的一维与二维表面态

DOI：
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发表时间：
2002
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影响因子：
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通讯作者：
A. Mascaraque
A. Mascaraque
中科院分区：
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文献类型：
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作者：
J. Ortega;A. Mugarza;V. Repain;S. Rousset;V. Pérez;A. Mascaraque

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用角分辨光电子能谱和同步辐射研究了邻位Au（788）和Au（322）的表面态。这两个表面的特征在于高度规则的一维台阶阵列，分别在Au（788）和Au（322）中具有相对宽（类似于3.9埃）或窄（类似于1.3埃）的台阶。根据平台的大小，我们观察到表面电子的行为完全不同。在Au（788）中，台阶变成一维的横向量子威尔斯阱，将表面电子限制在相邻台阶之间。在Au（322）表面，电子穿过台阶阵列传播，形成二维超晶格带。通过调整光子能量和角度，我们探测在这两种情况下的电子波函数的基本性质。
Surface states at vicinal Au(788) and Au(322) have been investigated with angle-resolved photoemission and synchrotron radiation. Both surfaces are characterized by highly regular one-dimensional step arrays with relatively wide (similar to3.9 Angstrom) or narrow (similar to1.3 Angstrom) terraces in Au(788) and Au(322), respectively. Depending on the terrace size we observe that surface electrons behave in a completely different way. In Au(788) terraces become one-dimensional, lateral quantum wells that confine surface electrons between adjacent steps. In Au(322) surface electrons propagate across the step array forming two-dimensional superlattice bands. By tuning photon energy and angle we probe fundamental properties of the electron wave functions in both cases.