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DTSTAMP:20260413T121041
DTSTART:20160126T103000
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DTEND:20160126T113000
URL:https://murmitoyen.com/events/vanille/udem/detail/676895-a-new-paradigm
 -for-polaronic-behaviour-mona-berciu-ubc
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:A new paradigm for polaronic behaviour - Mona Berciu (UBC)
DESCRIPTION:Mona Berciu\, Department of Physics & Astronomy\, University o
 f British Columbia
Any charge carrier distorts the lattice in its neighbor
 hood because of interactions with the ions making up the crystal (electron
 -phonon interactions). This results is a dressed quasiparticle\, -- the po
 laron -- which is the composite object comprising the carrier and this lat
 tice distortion that can be viewed as a cloud of phonons (quantized lattic
 e vibrations)  that are continuously absorbed and re-emitted by the carri
 er. This cloud may lead to a significant renormalization of the properties
  of the quasiparticle compared to those of the bare carrier\, which is why
  understanding the properties of polarons and their influence on the macro
 scopic behavior of the host material is one of the main challenges in cond
 ensed matter physics. The widely-accepted 'polaron paradigm' is that stron
 ger electron-phonon coupling leads to bigger lattice distortions and there
 fore heavier polarons. In this talk I will discuss recent work which shows
  that this is true only for models where the phonons modulate the potentia
 l energy of the carrier. If the phonons modulate the kinetic energy of the
  carrier\, one may find very light polarons at any coupling. The reason fo
 r this and other surprising findings will be discussed.
The web site of Pr
 ofessor Berciu.
Cette conférence est présentée par le RQMP Versant Nord
  du Département de physique de l'Université de Montréal et le Dépar
 tement de génie physique de Polytechnique Montréal.
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