双杂质Kondo问题中交叉跃迁的扫描隧道光谱证据
Scanning tunneling spectroscopic evidence of crossover transition in the two-impurity Kondo problem
摘要：
利用数值重整化群（NRG）方法计算了吸附在金属表面的两个磁性原子的微分电导（dI/dV），并与扫描隧道谱（STS）测量结果进行了比较.我们发现，费米能级附近dI/dV谱的峰结构随吸附原子间距以及吸附原子与金属表面导带之间的耦合而逐渐变化。当耦合变小时，峰消失，而是在费米能级附近出现凹陷结构。这种倾斜结构是局域自旋之间强反铁磁关联的表现。dI/dV结构从峰结构到谷结构的渐变源于双杂质近藤问题中的交叉跃迁。
英文摘要：
We calculate the differential conductance (dI/dV) corresponding to scanning tunneling spectroscopy (STS) measurements for two magnetic atoms adsorbed on a metal surface with the aid of the numerical renormalization group (NRG) technique. We find that the peak structure of the dI/dV spectra near the Fermi level changes gradually as a function of the adatom separation and the coupling between the adatoms and the metal surface conduction band. When the coupling becomes small, the peak disappears and, instead, a dip structure appears near the Fermi level. This dip structure is the manifestation of the strong antiferromagnetic correlation between the localized spins. The gradual change of the dI/dV structure from a peak structure to a dip structure originates from the crossover transition in the two impurity Kondo problem.
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