BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Evidence for spinarons in Co adatoms
DTSTART:20231110T161500
DTSTAMP:20260430T144533Z
UID:5264b61a9e322fc61b92afb210fda097a068f69bcc324fef3a09f8b3
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Artem Odobesko Physikalisches Institut\, Experimentelle Ph
 ysik II\, Universität Würzburg\, Am Hubland\, 97074 Würzburg\, Germany\
 nThe collective screening of an impurity spin by conduction electrons in t
 he Kondo effect represents a fundamental aspect of many-body physics. The 
 experimental identification of the Kondo effect in individual atoms is ass
 ociated with the emergence of a local electronic state at the Fermi level\
 , exhibiting characteristic temperature and field-dependent behaviors. Thi
 s phenomenon is marked by a zero-bias anomaly (ZBA) in the differential co
 nductance signal\, first observed in scanning tunneling spectroscopy (STS)
  experiments on Co atoms on the Au (111) surface. The ZBA results from a F
 ano resonance caused by the interference of tunneling paths into the Kondo
  state and atomic orbitals. Recent first-principle calculations suggest an
  alternative interpretation of the ZBA\, involving the formation of a nove
 l collective excitation\, the spinaron\, in contrast to the prevailing Kon
 do-based explanation.\n\nIn this study\, state-of-the-art spin-averaged an
 d spin-polarized scanning tunneling spectroscopy measurements were conduct
 ed on Co atoms on the Cu(111) surface in magnetic fields up to 12 T. The r
 esults revealed a field-induced energy shift and experimentally determined
  spin characteristics\, challenging the Kondo-based interpretation of the 
 ZBA in favor of the spinaron\, marking the first experimental detection of
  this novel many-body excitation. These findings disrupt the long-standing
  model system for the single-atom Kondo effect for Co atoms on coinage (11
 1) metal surfaces\, opening exciting possibilities for further exploration
  of spinaron physics.\n\n \n\nRefs:\n\n	Friedrich\, F.\, Odobesko\, A.\, 
 Bouaziz\, J. et al. Evidence for spinarons in Co adatoms. Nat. Phys. (
 2023)\n\n\n
LOCATION:PH L1 503 https://plan.epfl.ch/?room==PH%20L1%20503
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR