Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 71: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 2
O 71.3: Vortrag
Donnerstag, 8. September 2022, 15:45–16:00, S051
A new view on the origin of zero-bias anomalies of Co atoms atop noble metal surfaces — Juba Bouaziz1, Filipe S. M. Guimaraes1, and •Samir Lounis1,2 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, Jülich 52425, Germany — 2Faculty of Physics & CENIDE, University of Duisburg-Essen, 47057, Duisburg, Germany
Many-body phenomena are paramount in physics. In condensed matter, their hallmark is considerable on a wide range of material characteristics spanning electronic, magnetic, thermodynamic and transport properties. In this talk, we address systematically zero-bias anomalies detected by scanning tunneling spectroscopy on Co atoms deposited on Cu, Ag and Au(111) substrates, which remarkably are almost identical to those obtained from first-principles [1]. These features originate from gaped spin-excitations induced by a finite magnetic anisotropy energy, in contrast to the usual widespread interpretation relating them to Kondo resonances. Resting on relativistic time-dependent density functional and many-body perturbation theories, we furthermore unveil a new many-body feature, the spinaron, resulting from the interaction of electrons and spin-excitations localizing electronic states. Besides Co, we will show examples of anomalous spin-excitations characterising adatoms on Nb(110) surface [2,3].
[1] Bouaziz, Guimaraes, Lounis, Nat. Commun. 11, 6112 (2020);
[2] Brinker, Küster, Parkin, Sessi, Lounis, Science Adv. 8, eabi7291 (2022); [3] Küster, Montero, Guimaraes, Brinker, Lounis, Parkin, Sessi, Nat. Commun. 12, 1108 (2021).