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BEGIN:VEVENT
DTSTAMP:20260918T153339Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20111118T183000Z
DTEND:20111118T193000Z
UID:event300@bu.edu
URL:http://physics.bu.edu/internal/events/show/300
SUMMARY:Spin liquid and Deconfined Criticality in a Kagome Lattice Bose-Hub
	bard Model 
DESCRIPTION:Featuring Roger Melko\, University of Waterloo\, Canada\nHosted
	 by: Anders Sandvik\n\nPart of the Condensed Matter Theory Seminar Series.\
	n\nAbstract: We present large-scale quantum Monte Carlo simulations on a si
	gn-problem free Bose-Hubbard model on the kagome lattice. This model suppor
	ts a quantum Z2 spin liquid phase with fractional excitations and topologic
	al order\, which can be characterized definitively through calculation of t
	he topological entanglement entropy.  I will outline how the entanglem
	ent entropy can be measured in general using a direct implementation of the
	 familiar "replica trick"\, which allows for the study of entanglement scal
	ing in a variety of other models amenable to study by QMC.\nFinally\, I wil
	l examine the kagome model's superfluid/spin-liquid transition\, which is a
	n example of an exotic deconfined quantum critical point called XY*\, media
	ted by the fractional charges.  This fact is demonstrated in several u
	niversal quantities that we measure\, and may also be reflected the scaling
	 of entanglement entropy at the critical point.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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