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SUMMARY:Spectral signature of non-equilibrium\, high-density incoherent ex
 citons
DTSTART:20260520T130000Z
DTEND:20260520T140000Z
DTSTAMP:20260601T161700Z
UID:indico-event-18902@indico.psi.ch
CONTACT:matthias.krack@psi.ch
DESCRIPTION:Speakers: Katja Moos (PSI)\n\nThe coherence of excitons\, boun
 d particle-hole pairs\, is key for a number of non-equilibrium phenomena\,
  including the amplification of ultrafast shift currents or “self-driven
 ” exciton-Floquet effects. However\, coherence is often suppressed by sc
 attering processes on an ultrafast time scale. Still\, such incoherent non
 equilibrium states of excitons can have a profound impact on dynamical mat
 erial properties. In this work\, we investigate the effects of such long-l
 ived non-equilibrium states for the single-particle spectral function and 
 the signature in angle-resolved photoemission spectroscopy (ARPES). To thi
 s end\, we employ the nonequilibrium Green’s function (NEGF) approach. T
 o treat the excitons non-perturbatively\, we use the particlehole T-matrix
 . These calculations become tractable by using an efficient compressed rep
 resentation in the exciton basis.\n\nhttps://indico.psi.ch/event/18902/
LOCATION:OVGA/200
URL:https://indico.psi.ch/event/18902/
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