期刊
PHYSICAL REVIEW B
卷 61, 期 13, 页码 9036-9046出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.61.9036
关键词
-
A comprehensive theory is presented for the voltage, temperature, and spatial dependence of the tunneling current between a scanning tunneling microscope (STM) tip and a metallic surface with an individual magnetic adatom. Modeling the adatom by a nondegenerate Anderson impurity, a general expression is derived for a weak tunneling current in terms of the dressed impurity Green's function, the impurity-free surface Green's function, and the tunneling matrix elements. This generalizes Fano's analysis to the interacting case. The differential-conductance line shapes seen in recent STM experiments with the tip directly over the magnetic adatom are reproduced within our model, as is the rapid decay, similar to 10 Angstrom, of the low-bias structure as one moves the tip away from the adatom. With our simple model for the electronic structure of the surface, there is no dip in the differential conductance at approximately one lattice spacing from the magnetic adatom, but rather we see a resonant enhancement. The formalism for tunneling into small clusters of magnetic adatoms is developed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据