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SUMMARY:An analytical approach to a model of spin interactions in quartic 
 wells - Dr Godfrey Akpojotor\, Max Planck Institute for Physics of Complex
  Systems
DTSTART:20080417T131500Z
DTEND:20080417T141500Z
UID:TALK11588@talks.cam.ac.uk
CONTACT:Volker Heine
DESCRIPTION:The recent possibility to prepare\, manipulate and detect stro
 ngly correlated states using ultracold atoms in optical lattices have open
  new challenges to explore quantum magnetism. In particular\, recent exper
 imental demonstrations of the importance of both nearest neighbour (NN) su
 perexchange and direct interactions in femionic double wells (DW) has rein
 vigorated the theoretical search for model spin lattice Hamiltonians. In t
 his current study\, we investigate a model which includes these interactio
 ns to study the DW. To invoke the spirit of the experiments in which the l
 attice parameters can be controlled independently\, we have set up our var
 iational approach so that the kinetic part can be decoupled from the inter
 actions. This allows the switching on and varying of the lattice parameter
 s independently.  The simplicity of the approach makes it straightforward 
 to extend it to quartic wells.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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