Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)
O 58.72: Poster
Mittwoch, 13. März 2013, 18:15–21:45, Poster B1
Kondo effects in inelastic spin transitions — •Richard Korytár1, Nicolás Lorente2, and Jean-Pierre Gauyacq3 — 1Institut für Nanotechnologie, Karlsruher Institut für Technologie, Germany — 2Centro de investigación en nanociencia y nanotecnología CIN2, Barcelona, Spain — 3Institut de Sciences Moléculaires d'Orsay, Unité Mixte CNRS-Université, Orsay, France
Electron currents can induce magnetic excitations in molecular nano-structures. Magnetic inelastic electron tunneling spectroscopy (IETS) shows sharp increases in conductance when a magnetic excitation is induced by the incident electron. A previous one-electron theory successfully explained both the conductance thresholds and the magnitude of the conductance variation. The elastic spin flip of conduction electrons by a magnetic impurity leads to the well known Kondo effect. In the present work, we compare the theoretical predictions for inelastic magnetic tunneling obtained with a one-electron approach and with a many-body theory including Kondo-like phenomena. We apply our theories to a singlet-triplet transition model system that contains most of the characteristics revealed in magnetic IETS. We use two self-consistent treatments (non- crossing approximation and self-consistent ladder approximation). One of the main findings is that many-body effects translate into sharp peaks that appear close to the inelastic thresholds; the peaks being more robust than the Kondo resonance. Another consequence of the interaction with underlying electron gas is the reduction of the inelastic gap. This may render more difficult the extraction of magnetic anisotropy features for IETS experiments.