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DTSTAMP:20260411T215635
DTSTART:20171204T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/792724-charge-cinemat
 ography-n-making-movies-of-electrons-in-motion-across-semiconductor-n-prof
 -keshav-m-dani-okinawa-inst-of-sci-tech-graduate-univ
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Charge Cinematography – Making movies of electrons in motion acro
 ss semiconductor – Prof. Keshav M. Dani Okinawa Inst. of Sci. & Tech. Gr
 aduate Univ.
DESCRIPTION:Prof. Keshav M. Dani\, Femtosecond Spectroscopy Unit\, Okinawa
  Inst. of Sci. & Tech. Graduate Univ.\, 1919-1 Tancha\, Onna-son\, Okinawa
 \, Japan 904-0495
The flow of electrons in materials drives much of techno
 logy today – from our ability to generate electricity from light in sola
 r cell devices\, to transistors in modern computing machines. The ability 
 to directly image the flow of this charge promises to deepen our understan
 ding of the fundamental processes involved and impact future technology. H
 owever\, imaging the motion of charge requires sophisticated techniques wi
 th simultaneous high spatial and high temporal resolution. By combining th
 e femtosecond temporal resolution offered by ultrafast optical techniques\
 , with the nanoscale spatial resolution afforded by photoemission electron
  microscopy\, we make a movie – lasting just a few trillionths of a seco
 nd\, of the motion of electrons after light is absorbed in a solar cell st
 ructure\, thus capturing the essence of a very important 21st century tech
 nology [1]. We will end by discussing how our movie and the technique in g
 eneral can contribute to future understanding of physical phenomena at the
  nano-\, femto- scale.
 [1] Man\, M.\, et al.\, Nature Nanotech. 12\, 36-
 40 (2017)

Site web du groupe du Pr Dani
Cette conférence est présenté
 e par le RQMP Versant Nord du Département de physique de l'Universit
 é de Montréal et le Département de génie physique de Polytechnique M
 ontréal.

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