CONFINEMENT OF ELECTRONS TO QUANTUM CORRALS ON A METAL-SURFACE
CONFINEMENT OF ELECTRONS TO QUANTUM CORRALS ON A METAL-SURFACE
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DOI：
10.1126/science.262.5131.218
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发表时间：
1993-10-08
期刊：
影响因子：
56.9
通讯作者：
EIGLER, DM
中科院分区：
文献类型：
--
作者：
CROMMIE, MF;LUTZ, CP;EIGLER, DM
提出了一种在纳米尺度上将电子限制在人工结构中的方法。铜（111）表面上的表面态电子被限制在由铁吸附原子建立的势垒所限定的封闭结构（corpus）中。通过单独定位铁吸附原子与4开尔文扫描隧道显微镜（STM）的尖端组装的障碍。以这种方式用48个铁吸附原子构建了半径为71.3埃的圆形畜栏。在畜栏内进行的隧道光谱学揭示了一系列离散的共振，为尺寸量子化提供了证据。STM图像显示，围栏的内部局域态密度主要由被困在一个圆形的二维盒子中的电子的本征态密度所决定。
A method for confining electrons to artificial structures at the nanometer lengthscale is presented. Surface state electrons on a copper(111) surface were confined to closed structures (corrals) defined by barriers built from iron adatoms. The barriers were assembled by individually positioning iron adatoms with the tip of a 4-kelvin scanning tunneling microscope (STM). A circular corral of radius 71.3 angstrom was constructed in this way out of 48 iron adatoms. Tunneling spectroscopy performed inside of the corral revealed a series of discrete resonances, providing evidence for size quantization. STM images show that the corral's interior local density of states is dominated by the eigenstate density expected for an electron trapped in a round two-dimensional box.