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The European Physical Journal B

, Volume 81, Issue 4, pp 467–473 | Cite as

The exchange interaction effect in the scanning tunneling spectroscopy of a two-orbital Anderson impurity on metallic surface

  • G. -H. Ding
  • F. Ye
  • B. Dong
Mesoscopic and Nanoscale Systems Regular Article
  • 125 Downloads

Abstract

We investigate the scanning tunneling spectroscopy (STS) of a two-orbital Anderson impurity adsorbed on a metallic surface by using the numerical renormalization group (NRG) method. The density of state of magnetic impurity and the local conduction electron are calculated. We obtain the Fano resonance line shape in the STM conductance at zero temperature. For the impurity atom with antiferromagnetic inter-orbital exchange interaction and a spin singlet ground state, we show that a dip in the STM spectra around zero bias voltage regime and side peaks of spin excitation can be observed. The spin excitation energy is proportional to the exchange interaction strength. As the exchange interaction is ferromagnetic, the underscreened Kondo effect dominates the low energy properties of this system, and it gives rise to drastically different STM spectra as compared with the spin singlet case.

Keywords

Magnetic Impurity Fano Resonance Spin Excitation Scanning Tunneling Spectroscopy Numerical Renormalization Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.Department of PhysicsShanghai Jiao Tong UniversityShanghaiP.R. China
  2. 2.College of Material Science and Optoelectronics TechnologyGraduated University of Chinese Academy of ScienceBeijingP.R. China

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