Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 52: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies V

O 52.4: Vortrag

Mittwoch, 20. März 2024, 16:00–16:15, MA 004

Temperature evolution of the Kondo peak beyond Fermi liquid theory — •David Jacob — University of the Basque Country UPV/EHU, San Sebastian, Spain — IKERBASQUE, Basque Foundation for Science, Bilbao, Spain

The limitation of Fermi liquid theory to very low energies and temperatures poses a fundamental problem for describing the temperature evolution of the Kondo peak. Here Fermi liquid theory for the single impurity Anderson model is extended beyond the low-energy and low-temperature regime by means of an Ansatz for the impurity self-energy based on the accurate description of the Kondo peak by the Frota function and by exploiting Fermi liquid conditions. Analytic expressions for the temperature dependence of the Kondo peak height and width derived from this Ansatz are in excellent agreement with numerical renormalization group data for temperatures up to and beyond the Kondo temperature. The derived expression thus allows to unambiguously determine the intrinsic Kondo peak width and Kondo temperature from finite temperature measurements of the Kondo resonance, as measured by scanning tunneling spectroscopy of magnetic adatoms and molecules on conducting surfaces.

References: D. Jacob, Phys. Rev. B 108, L161109 (2023); E. Turco et al., arXiv:2310.09326 (2023)

Keywords: Kondo effect; Spins on surfaces; magnetic impurities; Scanning tunneling spectrocopy; Fermi liquid theory