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

  • Mesoscopic and Nanoscale Systems
  • Regular Article
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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.

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Authors and Affiliations

  1. Department of Physics, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China

    G. -H. Ding & B. Dong

  2. College of Material Science and Optoelectronics Technology, Graduated University of Chinese Academy of Science, Beijing, 100049, P.R. China

    F. Ye

Authors
  1. G. -H. Ding
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  2. F. Ye
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  3. B. Dong
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Correspondence to G. -H. Ding.

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Ding, G.H., Ye, F. & Dong, B. The exchange interaction effect in the scanning tunneling spectroscopy of a two-orbital Anderson impurity on metallic surface. Eur. Phys. J. B 81, 467–473 (2011). https://doi.org/10.1140/epjb/e2011-20155-5

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  • DOI: https://doi.org/10.1140/epjb/e2011-20155-5

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