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SUMMARY:Quantifying the effect of interactions in many-body systems - Jian
 nis Pachos\, Leeds
DTSTART:20171123T141500Z
DTEND:20171123T151500Z
UID:TALK87611@talks.cam.ac.uk
CONTACT:Steve Brierley
DESCRIPTION:Free fermion systems enjoy a privileged place in physics. With
  their simple structure they can explain a wide variety of effects\, rangi
 ng from insulating and metallic behaviour to superconductivity and the int
 eger quantum Hall effect. All their quantum properties can be derived by a
  small set of data that scales linearly with the system size. Interactions
 \, e.g. in the form of Coulomb repulsion\, can dramatically alter this pic
 ture giving rise to emerging physics that have no resemblance to free ferm
 ions. Within that realm physical effects such as high-temperature supercon
 ductivity\, fractional quantum Hall effect\, Kondo effect are met with the
  promise of a wide range of technological applications. Nevertheless\, the
  study of interacting systems is recognised as one of the hardest problems
  in physics due to the lack of a systematic approaches in solving them. In
  this talk I will present a general framework to study the manifestations 
 of interacting systems. The aim is to use quantum information tools to qua
 ntify the effect of interactions and to identify the optimal Gaussian stat
 es that best approximate their eigenstates.
LOCATION:MR5\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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