QUANTUM CORRALS
QUANTUM CORRALS
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DOI：
10.1016/0167-2789(94)00254-n
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发表时间：
1995-05-15
期刊：
影响因子：
4
通讯作者：
HELLER, EJ
中科院分区：
文献类型：
--
作者：
CROMMIE, MF;LUTZ, CP;HELLER, EJ
占据贵金属紧密堆积表面的电子形成二维(2D)近自由电子气，可用扫描隧道显微镜(STM)成像。我们发现，Fe原子对金属表面态电子有很强的散射，因此酸是构建原子尺度势垒来限制这些电子的很好的构建块。这些势垒(“量子栅栏”)是通过使用冷(4K)扫描隧道显微镜(STM)的尖端分别定位Fe原子来构建的。在畜栏内进行的隧道光谱显示了离散的共振，这与尺寸量化是一致的。通过考虑表面态电子与原子组成的吸附原子的多重散射，获得了更定量的理解。这种散射的特征是复杂的相移，它可以从量子围栏内的电子密度图案中提取出来。
Electrons occupying surface states on the close-packed faces of the noble metals form a two-dimensional (2D) nearly-free electron gas that can be imaged with a scanning tunneling microscope (STM). We find that Fe adatoms strongly scatter metallic surface state electrons, acid so are good building blocks for constructing atomic-scale barriers to confine these electrons. The barriers (''quantum corrals'') are constructed by individually positioning Fe adatoms using the tip of a cold (4K) STM. Tunneling spectroscopy performed inside of the corrals reveals discrete resonances, consistent with size quantization. A more quantitative understanding is obtained by accounting for the multiple-scattering of the surface state electrons with the corrals' constituent adatoms. This scattering is characterized by a complex phase shift which can be extracted from the electronic density pattern inside a quantum corral.