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SUMMARY:Ultrafast dynamics in photoexcited Bismuth surface and bulk states
DTSTART:20120611T121500
DTSTAMP:20260528T235420Z
UID:2382c1435803399aae12e21683ed4736a6cbff1396913ec36c8cd508
CATEGORIES:Conferences - Seminars
DESCRIPTION:Evangelos Papalazarou\, Laboratoire de Physique des Solides\, 
 UMR 8502\, Université Paris Sud\, Orsay\, France\nThe structure of the A7
  compounds may be described as a distorted simple cubic structure\, where 
 the (111) planes of atoms have an alternating displacement along the (111)
  direction. In one dimension\, this type of distortion is well known as Pe
 ierls distortion [1]. Bismuth is an A7 semimetal where Peierls instability
  causes a symmetry breaking along the trigonal (111) direction. Due to thi
 s distorted nature of the ground state photo‐induced excitation of valen
 ce electrons increases the electronic density in the conduction band there
 by reducing the energy gain of the Peierls distortion. This renders the Pe
 ierls distortion unstable and a phase transition towards an undistorted ph
 ase stands possible within a timescale inferior to that required for the e
 lectron‐phonon coupling thermalization.
LOCATION:CE1 100 http://plan.epfl.ch/?room=CE1100
STATUS:CONFIRMED
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