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SUMMARY:Ultrafast quantum ionic dynamics to stabilize hidden phases of mat
 ter - Lorenzo Monacelli\, University of Rome Sapienza
DTSTART:20250217T140000Z
DTEND:20250217T143000Z
UID:TALK228151@talks.cam.ac.uk
CONTACT:Dr Sun-Woo Kim
DESCRIPTION:Advancements in laser technology have unlocked the potential t
 o observe the real-time dynamics of nuclei on the femtosecond scale. Stron
 tium titanate (SrTiO3) presents a unique case as a quantum paraelectric ma
 terial characterized by its near-ferroelectric transition at low temperatu
 res\, which is inhibited by quantum nuclear fluctuations. I will present t
 he first atomistic and ab initio simulation of the time-resolved quantum n
 uclear dynamics of SrTiO3 under pulsed THz radiation. Our novel approach [
 1] accurately replicates the spectral features identified in time-resolved
  X-ray signals (like energy upconversion [2]) without any fitted parameter
  but also reveals the complex energy redistribution processes among all mo
 des following phonon-phonon scattering. We also show how it is possible to
  stabilize a dynamical ferroelectric phase [3\,4] thanks to the transient 
 strain induced by the nonlinear dynamics of nuclei. We demonstrate how fir
 st principles simulation can aid the design of nonequilibrium nuclear moti
 on to stabilize hidden phases of matter.\n\n[1] L Monacelli and F Mauri\, 
 Phys. Rev. B 103\, 104305 (2021)\n[2] M Kozina et al\, Nat Phys\, 15\, 387
  (2019)\n[3] T F Nova et al\, Science\, 364\, 1075 (2019)\n[4] X Li et al\
 , Science\, 364\, 1079 (2019)\n
LOCATION:zoom.us/j/92447982065?pwd=RkhaYkM5VTZPZ3pYSHptUXlRSkppQT09
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