单原子接触中的近藤效应：原子几何的重要性
Kondo effect in single atom contacts: the importance of the atomic geometry
摘要：
用扫描隧道显微镜和从头算研究了铜表面钴单原子结。测量了Cu（111）表面上单个钴原子在从隧穿到点接触的不同针尖-样品距离下的近藤温度。实验表明，在整个针尖-衬底距离范围内，近藤温度恒定，与Co的自旋极化d能级的预测能量位置一致。这与Co/Cu（100）结的实验有显著差异，计算结果表明，Co原子在两个Cu表面上的不同行为源于Co原子在两个Cu表面上的不同吸附行为，而Co原子在两个Cu表面上的不同吸附行为则是由于Co原子在两个Cu表面上的不同吸附行为引起的。结构弛豫和电子性质之间的相互作用，在近接触制度。
英文摘要：
Co single atom junctions on copper surfaces are studied by scanning tunneling microscopy and ab-initio calculations. The Kondo temperature of single cobalt atoms on the Cu(111) surface has been measured at various tip-sample distances ranging from tunneling to the point contact regime. The experiments show a constant Kondo temperature for a whole range of tip-substrate distances consistently with the predicted energy position of the spin-polarized d-levels of Co. This is in striking difference to experiments on Co/Cu(100) junctions, where a substantial increase of the Kondo temperature has been found. Our calculations reveal that the different behavior of the Co adatoms on the two Cu surfaces originates from the interplay between the structural relaxations and the electronic properties in the near-contact regime.
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