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SUMMARY:Intro talk: More than 60 years of Anderson Localization\, and coun
 ting... - Bart Van Tiggelen (CNRS (Centre national de la recherche scienti
 fique))
DTSTART:20230321T133000Z
DTEND:20230321T143000Z
UID:TALK195733@talks.cam.ac.uk
DESCRIPTION:The phenomenon of Anderson loclaization was proposed 65 years 
 ago to undertand the observed metal-insulator transition in electron condu
 ction.&nbsp\; An "often quoted but never read work" according to Co-Nobel 
 laureat Sir Nevil Mott\, "an unregognizable monster" according to its crea
 tor Phillip Anderson after reviewing 25 years of intense research. The fir
 st mathematical proofs of Anderson loclization of electrons in 3D at low e
 nergies appeared in 1983. Many attemps to observe electron localization we
 re conteststed. Numerical experiments - "indignified"&nbsp\; according to 
 its creator\, revealed Anderson localization\, accompanied by critical beh
 avior and finite-size scaling near the mobility edge. The first experiment
 s with classical waves were done at the end of the former century\, argued
  to be easier because free from dephasing and interaction. Localization of
  acoustic\, elastic and micro waves has been reported\, and recently even 
 the 3D localization of cold atoms in light speckle. The observation of 3D 
 light remains one of the holy grails. The sample needs to be one hundred m
 illion times denser than a fog with 1 meter visibility and this is challen
 ging. A recent numercial experiments done with randomly positionned\, reso
 nant electric dipoles revealed no Anderson transition\, not even for many 
 dipoles packed together within a cubic wavelength\, although this was wide
 ly believed to be&nbsp\; the simplest model to describe localization of li
 ght.&nbsp\; The vector nature of light\, and in particular its non-propaga
 ting longitudical component is a very specific feature. Does it create ano
 ther transport channel\, so to prevent light to localize in this model? We
  will give an argument what breaks down in Anderson's "Theory of White Pai
 nt".&nbsp\; &nbsp\; &nbsp\; &nbsp\;&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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