期刊
PHYSICAL REVIEW LETTERS
卷 92, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.92.206101
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Systematic, quantitative comparisons between scanning tunneling microscopy (STM) experiments and first principles simulations of O(2x2)/Ru(0001) have been performed. The shape of the atomic adsorbates in the images depends strongly on the tunneling resistance and changes reversibly from circular (high resistance) to triangular (low resistance). In addition, after adsorption of oxygen on the STM tip we observe a contrast reversal on the surface, confirmed by extensive numerical simulations.
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