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arXiv 0910.4466cond-mat.mes-hallcond-mat.mtrl-sci
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层错缺陷附近金属薄膜量子阱态微扰的可视化

Visualizing Quantum Well State Perturbations of Metallic Thin Films near Stacking Fault Defects

Alexander A. Khajetoorians, Gregory A. Fiete, Chih-Kang Shih

摘要:

我们表明,量子阱态(QWS)的薄铅膜内的本征膜缺陷附近的高度扰动。扫描隧道能谱(STM/STS)的测量表明,这些状态的能量有一个很强的距离依赖性在4 nm的缺陷与最强的能量波动等于高达100毫电子伏。这些局部扰动显示大的空间依赖的不对称性,在LDOS周围的缺陷部位为每个相应的量子阱状态。这些充满活力的波动可以描述一个简单的模型,占地形变化引起的限制电位的波动。

英文摘要:

We demonstrate that quantum well states (QWS) of thin Pb films are highly perturbed within the proximity of intrinsic film defects. Scanning Tunneling Spectroscopy (STM/STS) measurements indicate that the energy of these states have a strong distance dependence within 4 nm of the defect with the strongest energetic fluctuations equaling up to 100 meV. These localized perturbations show large spatially-dependent asymmetries in the LDOS around the defect site for each corresponding quantum well state. These energetic fluctuations can be described by a simple model which accounts for fluctuations in the confinement potential induced by topographic changes.

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