SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 33: Spins on Surfaces at the Atomic Scale III
O 33.1: Topical Talk
Dienstag, 28. März 2023, 10:30–11:00, REC C 213
Fermi liquids, Luttinger integrals, topological invariants ... and magnetic molecules — •Rok Zitko1,2, German G. Blesio1,3, Luis O. Manuel3, and Armando A. Aligia4 — 1Jozef Stefan Institute, Ljubljana, Slovenia — 2Faculty of Mathematics and Physics, University of Ljubljana, Slovenia — 3Instituto de Fisica Rosario (CONICET) and Universidad Nacional de Rosario, Argentina — 4INN CNEA-CONICET, Centro Atomico Bariloche and Instituto Balseiro, Bariloche, Argentina
The ground state of a system of interacting fermions is often a Fermi liquid with elementary excitations that are in a one-to-one correspondence with those of a non-interacting Fermi gas. A key idea in Landau's theory is the adiabatic connection between the interacting and the non-interacting system. The adiabatic connection does not, however, always exist and there are several impurity problems where the ground state is known to be a Fermi liquid that is not of the Landau type. I will present the case of the two-channel S=1 Kondo model with single-ion magnetic anisotropy which has a topological quantum phase transition separating two different Fermi-liquid phases. I will discuss how the conservation laws constrain the Luttinger integrals so that their linear combinations become topological invariants, and how the modified Friedel sum rules lead to a peculiar variation of the impurity spectral function. I will then show that the tunneling spectra of iron phthalocyanine molecules on Au(111) surface and of nickelocene molecules on Cu(100) surface can be consistently interpreted in the framework of non-Landau Fermi liquid theory.