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SUMMARY:Fermionic spinon and holon statistics in the pyrochlore quantum sp
 in liquid - Bruce Normand\, Paul Scherrer Institute\, Switzerland
DTSTART:20160519T131500Z
DTEND:20160519T141500Z
UID:TALK63901@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:We prove that the insulating one-band Hubbard model on the pyr
 ochlore lattice contains\, for realistic parameters\, an extended quantum 
 spin-liquid phase. This is a three-dimensional spin liquid formed from a h
 ighly degenerate manifold of dimer-based states\, which is a subset of the
  classical dimer coverings obeying the ice rules. It possesses spinon exci
 tations\, which are both massive and deconfined\, and on doping it exhibit
 s spin-charge separation. We demonstrate that the spinons have fermionic s
 tatistics\, and further that the holons introduced by doping are also ferm
 ions. We explain the origin of this counterintuitive result and establish 
 the connection of these emerging fermions with U(1) gauge fields\, represe
 nted by strings\, as anticipated by Levin and Wen.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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