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SUMMARY:Dynamics and critical behaviour of the spin-boson model - Andreas 
 Alvermann\, University of Cambridge
DTSTART:20101104T141500Z
DTEND:20101104T151500Z
UID:TALK27396@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:The spin-boson model\, describing a two-state system coupled t
 o a bath of harmonic oscillators\, serves as a paradigmatic example for qu
 antum dissipative systems. Notable effects are the non-Markovian character
  of spin dynamics and the existence of a quantum phase transition at stron
 ger dissipation. The talk will discuss selected aspects of the spin-boson 
 model\, including the controversy about the nature of the sub-ohmic quantu
 m phase transition and its resolution. The basis of our investigation is a
  recently developed numerical approach\, which extends the application ran
 ge of exact diagonalization techniques to open quantum systems with contin
 uous bath degrees of freedom.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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