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BEGIN:VEVENT
DTSTAMP:20260812T023312Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20110420T180000Z
DTEND:20110420T190000Z
UID:event808@bu.edu
URL:http://physics.bu.edu/internal/events/show/808
SUMMARY:Z2 spin liquid and chiral antiferromagnetic phase in Hubbard model 
	on the honeycomb lattice: duality between Schwinger-fermion and Schwinger-b
	oson representations 
DESCRIPTION:Featuring Ying Ran\, Boston College\n\nPart of the Condensed Ma
	tter Theory Seminar Series.\n\nAbstract:\n In a recent remarkable quantum M
	onte Carlo simulation of the hubbard model on honeycomb lattice\, a spin di
	sordered Mott insulator phase is discovered in the intermediate correlation
	 regime. Using Projective Symmetry Group classification and physical argume
	nts\, we identify this spin liquid phase as the Sublattice-Pairing State (S
	PS) in the\n Schwinger-fermion representation. In addition\, we show that S
	PS is identical to the zero-flux Z2 spin liquid in Schwinger-boson represen
	tation found by Wang via an explicit duality transformation. SPS is connect
	ed to an unusual antiferromagnetic ordered phase\, which we term as chiral-
	antiferromagnetic (CAF) phase\, by an O(4) critical point.  CAF phase 
	breaks the SU(2) spin rotation symmetry completely and has three Goldstone 
	modes. Our results indicate that there is likely a hidden phase transition 
	between CAF phase and simple AF phase at large U/t. We propose numerical me
	asurements to reveal the CAF phase and the hidden phase transition.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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