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SUMMARY:Waterfalls: umbilical cords at the birth of Hubbard bands - Juraj 
 Krsnik\, Institute of Solid State Physics\, TU Wien\, Austria
DTSTART:20241104T140000Z
DTEND:20241104T143000Z
UID:TALK223687@talks.cam.ac.uk
CONTACT:Dr Sun-Woo Kim
DESCRIPTION:Waterfalls are high-energy anomalies in an angle-resolved phot
 oemission spectroscopy (ARPES) spectrum characterized by a steep drop of m
 omentum-energy dispersion and a significantly smeared spectrum. These anom
 alies have been frequently observed in cuprates [1-3]\, and more recently 
 in superconducting nickelates [4\,5]\, with the onset of the waterfall occ
 urring at around 100-200 meV and extending up to approximately ~1eV. \n\nH
 ere we argue that waterfalls naturally emerge within the one-band Hubbard 
 model when a Hubbard band develops and separates from the quasiparticle ba
 nd. We demonstrate this by treating the electronic correlations on the lev
 el of dynamical mean-field theory (DMFT) [6]\, and further exclude that no
 n-local correlations are in play by performing dynamical vertex approximat
 ion (DGA) [7] calculations. We also calculate the second derivatives of th
 e momentum distributions curves (MDCs)\, which highlight the waterfall-lik
 e structures even more clearly than the bare spectra. \n\nFinally\, we com
 pare our results for the Hubbard model with the ab initio determined param
 eters with the measured spectra in cuprates and nickelates for various lev
 els of hole doping. Our findings show a good agreement between the theoret
 ical predictions and experimental observations.\n\n[1] B. P. Xie et al.\, 
 PRL 98\, 147001 (2007).\n[2] T. Valla et al.\, PRL 98\, 167003 (2007).\n[3
 ] W. Meevasana et al.\, PRB 75\, 174506 (2007).\n[4] W. Sun et al.\, arXiv
 :2403.07344 (2024).\n[5] X. Ding et al.\, arXiv:2403.07448 (2024).\n[6] A.
  Georges et al.\, RMP 68\, 13 (1996).\n[7] G. Rohringer et al.\, RMP 90\, 
 25003 (2018).\n
LOCATION:https://zoom.us/j/92447982065?pwd=RkhaYkM5VTZPZ3pYSHptUXlRSkppQT0
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