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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Collective electronic transport close to the metal
 -insulator or superconductor insulator transitions
 . - Mueller\, M (Universit de Genve)
DTSTART;TZID=Europe/London:20081217T100000
DTEND;TZID=Europe/London:20081217T110000
UID:TALK15740AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/15740
DESCRIPTION:Insulators close to the transition to a metal or a
  superconductor exhibit interesting collective ele
 ctronic phenomena which are prominently reflected 
 in transport properties. An important feature in s
 ystems close to the metal-insulator transition is 
 the apparently purely electronic nature of activat
 ed transport seen in experiments. This does not fi
 t into the standard theory of phonon-assisted hopp
 ing conduction and has remained an unexplained puz
 zle for decades. It also seems to contradict recen
 t theories of many body localization (localization
  in the Fock space of interacting systems)\, which
  have predicted a finite temperature metal insulat
 or transition for interacting\, Anderson localized
  electrons. I will address this problem for Anders
 on insulators with a single-particle localization 
 length much larger than the mean distance between 
 electrons. I will argue that under these circumsta
 nces Coulomb interactions drive the electrons into
  a strongly correlated quantum glass phase with a 
 gapless spectrum of delocalized collective excitat
 ions which act as a bath with which individual ele
 ctrons can exchange energy. However\, the same rea
 soning does not necessarily apply close to a insul
 ator-to-superconductor transition\, where electron
 s are bound into preformed Cooper pairs and Coulom
 b interactions are weak. I will argue that these s
 ystems are promising candidates to exhibit strong 
 remnants of many body localization\, which may be 
 the key to an explanation for their unusual transp
 ort properties.
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:Mustapha Amrani
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