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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3596
DTSTART:20150122T220000Z
DTEND:20150122T230000Z
DTSTAMP:20260416T144444Z
LAST-MODIFIED:20150119T204314Z
LOCATION:4274 Chamberlin Hall
SUMMARY:Magnetism\, rotons\, and beyond: engineering atomic systems wi
 th lattice shaking\, Atomic Physics Seminar\, Colin Parker\, Universit
 y of Chicago\, James Franck Institute and Department of Physics
DESCRIPTION:Conventional methods of quantum simulation rely on kinecti
 c energy determined by free particle dispersions or simple sinusoidal 
 optical lattices. Solid state sytems\, by contrast\, exhibit a plethor
 a of band structures which differ quantitatively\, qualitatively\, and
  even topologically. To what extent does this variety explain the many
  electronic phenomena observed in these materials? Here we address thi
 s question by subjecting an otherwise simple Bose superfluid to a cust
 omized band structure engineered by dynamically phase modulating (shak
 ing) an optical lattice. The engineered dispersion contains two minima
  which we associate to a pseudospin degree of freedom. Surprisingly\, 
 in such a system the Bose superfluid exhibits many new behaviors. The 
 psuedospin develops a ferromagnetic order\, which can lead to polariza
 tion of the entire sample or to sub-division into polarized domains. T
 he excitations of the system also exhibit the roton-maxon structure as
 sociated with strong interactions in superfluid helium.
URL:https://www.physics.wisc.edu/events/?id=3596
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