Physics department (Colloquium)

Kondo-mania -- the Kondo effect and its relevance to various materials classes

Speaker : - Prof. Stefan Kirchner 科契諾教授 (陽明交大電物系 NYCU Electrophysics)
Time : 2024 / 05 / 10 14:10
Room 36102, 1F, Department of Physics, Science Building
The Kondo effect is named after Jun Kondo, who contributed significantly to its explanation more than 30 years after its first observation.
In the 1970s and 1980s, the Kondo effect was essential in developing renormalization group techniques in condensed matter science.  In more recent years, the discoveries of unconventional quantum criticality, bad metal, and non-Fermi liquid phases in various materials classes have led to a renewed interest in the role played by Kondo screening [1].

In this talk, I will review the basics of Kondo physics and discuss some of the more modern developments, i.e., critical Kondo destruction and its experimental signatures in rare earth intermetallics [2] and the observation of an orbital two-channel Kondo effect in IrO2 [3].

[1] S. Kirchner & S. Paschen, "Kondo-Mania", Phys. Unserer Zeit  53 , (2022) [in German].
[2]  S. Kirchner et al., "Heavy-electron quantum criticality and single-particle spectroscopy," Rev. Mod.Phys. 92,  (2020).
[3] S.-S. Yeh et al., "Oxygen vacancy-driven orbital multichannel Kondo effect in Dirac nodal line metals IrO2 and RuO2", Nat. Commun. 11, (2020).