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SUMMARY:Strongly driven coherent quantum systems - Dieter Jaksch (Universi
 ty of Oxford)
DTSTART:20120126T141500Z
DTEND:20120126T151500Z
UID:TALK35408@talks.cam.ac.uk
CONTACT:Paul Skrzypczyk
DESCRIPTION:Recent experimental progress enables the study of strongly int
 eracting systems which are driven to exotic quantum states by strong exter
 nal fields. Examples include cold gases of Rydberg atoms with strong dipol
 e-dipole interactions and organic salts where valence electrons are couple
 d to localized molecular vibrations. In both cases equilibration takes muc
 h longer than the duration of the pump pulses and insights into the physic
 s can therefore be gained by considering purely coherent evolution away fr
 om their initial equilibrium state. In this talk I will first present the 
 method of Path-Sums which allows to efficiently evaluate matrix functions\
 , and show how we apply it to determining long-range diagonal and off-diag
 onal order through Rydberg blockade and anti-blockade in ultracold atomic 
 ensembles. I will then introduce Tensor Network Theory which is based on i
 nsights into the properties and scaling of entanglement and discuss how we
  use it to describe the coherent evolution of a Hubbard model which accura
 tely describes the physics of the organic salt (BEDT-TTF)-F2TCNQ at room t
 emperature\, thus indicating quantum coherent electron dynamics.
LOCATION:MR4\, Centre for Mathematical Sciences
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