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BEGIN:VEVENT
DTSTAMP:20260815T120453Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20110228T150000Z
DTEND:20110228T160000Z
UID:event780@bu.edu
URL:http://physics.bu.edu/internal/events/show/780
SUMMARY:Ying Tang - Preliminary Oral Exam
DESCRIPTION:\nPart of the Preliminary Oral Exam.\n\nTitle:  Properties of R
	esonating-Valence-Bond Spin Liquids and\nCritical Dimer Models\n\nExamining
	 Committee:  Anders Sandvik\, Richard Averitt\, Claudio Chamon\, Emanuel Ka
	tz\n\nAbstract:\nWe use Monte Carlo simulations to study properties of Ande
	rson’s resonating-\nvalence-bond (RVB) spin-liquid state on the square la
	ttice and compare these\nresults with a similar state – the ground st
	ate of the quantum dimer model\nat its critical point (the Rokhsar-Kivelson
	 point)\, which also corresponds\nto the statistical mechanics of the class
	ical dimer model (CDM). We measured\nthe dimer-dimer (4-spin) correlations 
	and found that in both RVB and\nCDM states\, dimer-dimer correlations decay
	 as a power-law. In RVB\, the\ndimer-dimer correlations decay more slowly t
	han in CDM. We also measured\nthe monomer deconfinement and topological win
	ding number sector prob-\nabilities in both states and found qualitatively 
	similar but quantitatively\ndifferent properties between RVB and CDM. We fu
	rther framed our RVB\nstudies to a classical field theory (height model) wh
	ich is characterized by a\ngradient-squared stiffness constant K. We did fo
	ur independent\nmeasurements of K and found K_RVB ≈ 1.6K_CDM \, which ind
	icates a plausibility of\nthe height model approach for SU(2) spins (RVB) b
	y a renormalization of the\nstiffness constant. We also extended our work t
	o long bond RVB and CDM\nand obtained a smooth reduction of K as expected.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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