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VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260815T210050Z
LAST-MODIFIED:20171201T164740Z
DTSTART:20171204T153000Z
DTEND:20171204T163000Z
UID:event1864@bu.edu
URL:http://physics.bu.edu/internal/events/show/1864
SUMMARY:"Quantum Hall Ferromagnetism in $\nu=0$ Bilayer Graphene"
DESCRIPTION:Featuring Ganpathy Murthy\, University of Kentucky\nHosted by: 
	Anushya Chandran\n\nPart of the Condensed Matter Theory Seminar Series.\n\n
	In the presence of a quantizing magnetic field\, the lowest energy manifold
	 of bilayer graphene (BLG) has spin\, valley\, and a two-fold orbital degen
	eracy. Experimentally\, it can be tuned by applying a parallel magnetic fie
	ld and by applying a perpendicular electric field\, which tends to polarize
	 the layers. At charge neutrality\, which corresponds to $\nu=0$\, the syst
	em can choose among  a rich set of possible ground states based on the effe
	ctive interactions and external tuning parameters. We will set up a simple 
	model Hamiltonian containing symmetry-allowed terms and analyze it in the H
	artree-Fock approximation to obtain several potential ground states\, some 
	of which have been obtained before (such as the canted antiferromagnet and 
	the fully layer polarized phase) and one which has not. This new ground sta
	te breaks two different U(1) symmetries spontaneously\, and could appear as
	 an intermediate phase between the canted antiferromagnet and the fully lay
	er polarized phases.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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