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SUMMARY:From photons to phonons and polarons: pump-probe and ab initio stu
 dies of cobalt oxide
DTSTART:20261008T090000Z
DTEND:20261008T100000Z
DTSTAMP:20261030T135100Z
UID:indico-event-1678@indico.ifj.edu.pl
DESCRIPTION:Speakers: Przemysław Piekarz (Institute of Nuclear Physics Po
 lish Academy of Sciences)\n\nUltrafast optical spectroscopy and density fu
 nctional theory were used to study coherent lattice oscillations and forma
 tion of Jahn-Teller polarons in cobalt oxide. The study shows that selecti
 ve excitation at 3.10 eV induces oxygen-to-cobalt charge transfer\, conver
 ting octahedral Co(III) into Co(II) and triggering local symmetry breaking
 . This distortion lifts the orbital degeneracy\, localizes excess charge i
 n Co 3d states\, and stabilizes polaronic in-gap electronic states. The pr
 ocess generates a coherent lattice oscillation at 10.1 meV\, which is abse
 nt in the equilibrium phonon spectrum. In contrast\, excitation at 1.55 eV
  selectively modulates tetrahedral Co(II) sites and launches a coherent Ra
 man mode at 24.3 meV. These findings establish state-selective ultrafast e
 xcitation as a tool for investigating and controlling coupled electronic a
 nd structural dynamics in correlated materials. \n\nhttps://indico.ifj.ed
 u.pl/event/1678/
URL:https://indico.ifj.edu.pl/event/1678/
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