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Spin-polarized STM for a Kondo adatom
A C Seridonio1, F M Souza, I A Shelykh
1ICCMP-International Center for Condensed Matter Physics, Universidade de Brasília, 04513 Brasília, DF, Brazil. Instituto de Física, Universidade Federal Fluminense, 24310-246, Niterói, RJ, Brazil.
Spin-polarized scanning tunneling microscopy reveals quantum interference effects in Kondo adatom systems. The Kondo peak splitting and asymmetry depend on tip-adatom distance, with increasing distances suppressing splitting and revealing a Fano-Kondo profile.
Area of Science:
- Condensed Matter Physics
- Surface Science
- Quantum Mechanics
Background:
- Kondo effect in metallic systems
- Scanning Tunneling Microscopy (STM) principles
- Spin-polarized tunneling phenomena
Purpose of the Study:
- Investigate bias dependence of tunneling conductance
- Study quantum interference in SP-STM with Kondo adatoms
- Analyze Fano parameter influence on conductance
Main Methods:
- Spin-polarized scanning tunneling microscopy (SP-STM)
- Theoretical modeling of quantum interference
- Analysis of Fano parameter (q) effects
Main Results:
- Observed splitting of Kondo peak due to spin polarization
- Asymmetry in zero-bias anomaly dependent on tip-adatom distance
- Suppression of Kondo peak splitting at larger distances
Conclusions:
- SP-STM is sensitive to lateral tip-adatom distance
- Quantum interference dictates spin-dependent conductance profiles
- System exhibits standard Fano-Kondo profile at sufficient distances
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