OBSERVATION OF QUANTUM-SIZE EFFECTS AT ROOM-TEMPERATURE ON METAL-SURFACES WITH STM
OBSERVATION OF QUANTUM-SIZE EFFECTS AT ROOM-TEMPERATURE ON METAL-SURFACES WITH STM
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DOI：
10.1126/science.264.5161.942
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发表时间：
1994-05-13
期刊：
影响因子：
56.9
通讯作者：
LYO, IW
中科院分区：
文献类型：
--
作者：
AVOURIS, P;LYO, IW
表面台阶充当金属表面态电子的限制势垒。因此，狭窄的平台和小的单原子高金属岛充当低维电子限制结构。在足够小的结构中，即使在室温下也可以观察到量子尺寸效应。扫描隧道光谱用于对受限态的概率幅度分布和离散光谱进行成像。对台阶电子结构的检查为电子密度平滑和台阶边缘态的形成提供了证据。获得了电子限制势垒的估计值。
Surface steps act as confining barriers for electrons in metal-surface states. Thus, narrow terraces and small single-atom-high metal islands act as low-dimensional, electron-confining structures. In sufficiently small structures, quantum-size effects are observable even at room temperature. Scanning tunneling spectroscopy is used to image the probability amplitude distributions and discrete spectra of the confined states. Examination of the electronic structure of the steps provides evidence for electron-density smoothing and the formation of step-edge states. Estimates of the electron-confining barriers are obtained.