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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2018

The Kondo resonance line shape in scanning tunnelling spectroscopy: instrumental aspects

Résumé

In the scanning tunnelling microscope, the many-body Kondo effect leads to a zero-bias feature of the differential conductance spectra of magnetic adsorbates on surfaces. The intrinsic line shape of this Kondo resonance and its temperature dependence in principle contain valuable information. We use measurements on a molecular Kondo system, all-trans retinoic acid on Au(111), and model calculations to discuss the role of instrumental broadening. The modulation voltage used for the lock-in detection, noise on the sample voltage, and the temperature of the microscope tip are considered. These sources of broadening affect the apparent line shapes and render difficult a determination of the intrinsic line width, in particular when variable temperatures are involved.
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Dates et versions

hal-01883180 , version 1 (27-09-2018)

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Manuel Gruber, Alexander Weismann, Richard Berndt. The Kondo resonance line shape in scanning tunnelling spectroscopy: instrumental aspects. Journal of Physics: Condensed Matter, 2018, 30 (42), ⟨10.1088/1361-648X/aadfa3⟩. ⟨hal-01883180⟩

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