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UID:DSC-22819
DTSTART;TZID=Europe/Berlin:20260518T145000
SEQUENCE:1778045825
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20260518T162000
URL:https://dresden-science-calendar.de/calendar/en/detail/22819
LOCATION:TUD\,    
SUMMARY:Fedchenko: Photoelectron Spectroscopy of Electronically Correlated 
 Materials: Chirality in the Kagome Metal CsV₃Sb₅
CLASS:PUBLIC
DESCRIPTION:Speaker: Olena Fedchenko\nInstitute of Speaker: Goethe Universi
 tät Frankfurt\nTopics:\nPhysik\n Location:\n  Name: TUD (REC/C213)\n  Str
 eet:   \n  City:  \n  Phone: \n  Fax: \nDescription: <p><strong>Abstract</
 strong></p> <p>Kagome metals AV3Sb5 (where A = Cs\, K\, Rb) have a complex
  electronic structure comprising flat bands\, Dirac crossings and van Hove
  singularities. These features can lead to unconventional charge-density-w
 ave (CDW) order\, superconductivity and topological phenomena. In CsV3Sb5\
 , the CDW transition has been associated with time-reversal symmetry break
 ing\, orbital magnetism\, and chirality. This talk summarises x-ray photoe
 lectron diffraction (XPD) and angle-resolved photoemission spectroscopy (A
 RPES) studies of this system using circularly polarised photons.</p> <p>XP
 D reveals a loss of mirror symmetry and the formation of a locally chiral 
 atomic structure in the CDW phase. Complementary ARPES measurements reveal
  pronounced nontrivial magnetic circular dichroism in the valence-band ele
 ctronic structure\, suggesting the presence of electronic chirality and ti
 me-reversal symmetry breaking. Partially substituting V atoms with isoelec
 tronic Nb atoms results in band broadening and increased gap opening at th
 e Dirac-like crossings due to the resulting chemical pressure. Isoelectron
 ic Nb substitution also results in stronger coupling of orbital magnetic m
 oments to three van Hove singularities near the Fermi level at the M point
 s. This enhances the magnetic circular dichroism (MCD) signal compared to 
 pristine CsV3Sb5 and confirms the predicted coupling of orbital magnetic m
 oments to three van Hove singularities near the Fermi level at the M point
 s.</p> <p><strong>Z</strong><strong>oom</strong><strong>:</strong> 633 280
 1 2201 (https://tu-dresden.zoom-x.de/j/63328012201?pwd=jFjgmPWVLgobCkrIMab
 0jFS2jLXcWg.1)\, Passcode: IFMP2025-6</p>
DTSTAMP:20260506T160909Z
CREATED:20260414T053710Z
LAST-MODIFIED:20260506T053705Z
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