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SUMMARY:Evidence for a Peierls phase-transition in a three-dimensional mul
 tiple charge-density waves solid
DTSTART:20120921T141500
DTSTAMP:20260929T061127Z
UID:5e09f6c84866ee3f1d40a10566603ed7bc7ca55b5c2ee369deb7f898
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Barbara Mansart\,  Laboratory for Ultrafast Microscopy an
 d Electron Scattering  and Laboratory of Ultrafast Spectroscopy - EPFL\nW
 e studied the ultrafast photoinduced charge-density-wave (CDW) to metal ph
 ase transition in a complex solid\, namely Lu5Ir4Si10. After melting the c
 harge ordering using infrared laser pulses\, the consequent charge redistr
 ibution is probed with femtosecond time resolution through the spectral we
 ight analysis of the transient optical response over a broad energy range.
  The time-dependent spectral weight reveals a signature of the CDW melting
  and the time-scale of this photo-induced phase transition. This new kind 
 of analysis allows us to show that the charge order remains preserved unti
 l the lattice distorts sufficiently to induce the phase transition. These 
 results are completed by ab-initio modeling of the electronic band structu
 re\, identifying the orbitals involved in the CDW and the electronic trans
 itions leading to the photo-induced melting of the charge order. This allo
 ws us to reveal the Peierls origin of multiple CDW in this three-dimension
 al solid.\n\nco-authors: M.J.G. Cottet \, T. J. Penfold\, S. B. Dugdale\, 
 R. Tediosi\, M. Chergui and F. Carbone
LOCATION:PH L1 503 http://plan.epfl.ch/?&room=phl1503
STATUS:CONFIRMED
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