The signature of subsurface Kondo impurities in the local tunnel current
arXiv:0801.4831 · doi:10.1088/0953-8984/20/11/115208
Abstract
The conductance of a tunnel point-contact in an STM-like geometry having a single defect placed below the surface is investigated theoretically. The effect of multiple electron scattering by the defect after reflections by the metal surface is taken into account. In the approximation of s-wave scattering the dependence of the conductance on the applied voltage and the position of the defect is obtained. The results are illustrated for a model s-wave phase shift describing Kondo-resonance scattering. We demonstrate that multiple electron scattering by the magnetic impurity plays a decisive role in the point-contact conductance at voltages near the Kondo resonance. We find that the sign and shape of the Kondo anomaly depends on the position of the defect.
arXiv comment13 pages, 4 figures. To be published in J. Phys.: Cond. Mat
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Cited by in corpus (6)
- Interplay between Kondo effect and Ruderman-Kittel-Kasuya-Yosida interaction
- Theory of oscillations in the STM conductance resulting from subsurface defects (Review Article)
- Quantum interference effects in a system of two tunnel point-contacts in the presence of single scatterer: simulation of a double-tip STM experiment
- Magneto-orientation and quantum size effect in SP-STM conductance in the presence of a subsurface magnetic cluster
- Influence of a single defect on the conductance of a tunnel point contact between a normal metal and a superconductor
- Conductance of a STM contact on the surface of a thin film