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BEGIN:VEVENT
DTSTAMP:20260913T084302Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20110302T160000Z
DTEND:20110302T170000Z
UID:event781@bu.edu
URL:http://physics.bu.edu/internal/events/show/781
SUMMARY:The Paired Electron Crystal: order from frustration in the quarter-
	filled band
DESCRIPTION:Featuring Torsten Clay\, Mississippi State University\n\nPart o
	f the Condensed Matter Theory Seminar Series.\n\nAbstract:\nThe competition
	 between antiferromagnetic and spin-singlet ground states within quantum sp
	in models and the 1/2-filled band Hubbard model has received intense scruti
	ny. In comparison\, relatively little is known about the effect of lattice 
	frustration in strongly correlated models away from 1/2 filling. Here we co
	nsider the effect of frustration in the two-dimensional interacting 1/4-fil
	led band\, and show that a frustration-induced transition from Neel antifer
	romagnetism to a spin-singlet state occurs. While the antiferromagnetic sta
	te has equal charge densities 0.5 on all sites\, the spin-singlet state is 
	a paired-electron crystal (PEC)\, with pairs of charge-rich sites separated
	 by pairs of charge-poor sites. The PEC provides a natural description of t
	he spin-gapped state proximate to superconductivity (SC) in many organic ch
	arge-transfer solids.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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