Surface diffusion of Cr adatoms on Au(111) by quantum tunneling.
Surface diffusion of Cr adatoms on Au(111) by quantum tunneling.
复制标题
通过量子隧道效应实现 Cr 吸附原子在 Au(111) 上的表面扩散。
DOI:
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发表时间:
2005
影响因子:
8.6
通讯作者:
F. Scheurer
中科院分区:
文献类型:
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作者:
P. Ohresser;H. Bulou;S. Dhesi;C. Boeglin;B. Lazarovits;É. Gaudry;I. Chado;J. Faerber;F. Scheurer
The low-temperature surface diffusion of isolated Cr adatoms on Au(111) has been determined using nonperturbing x rays. Changes in the x-ray magnetic circular dichroism spectral line shape together with Monte Carlo calculations demonstrate that adatom nucleation proceeds via quantum tunneling diffusion rather than over-barrier hopping for temperatures <40K. The jump rates are shown to be as much as 35 orders of magnitude higher than that expected for thermal over-barrier hopping at 10 K.