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BEGIN:VEVENT
DTSTAMP:20261014T063536Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20100510T150000Z
DTEND:20100510T160000Z
UID:event645@bu.edu
URL:http://physics.bu.edu/internal/events/show/645
SUMMARY:Flavor-Hall effect and nonlocal charge transport in graphene 
DESCRIPTION:Featuring Dima Abanin\, Princeton University\n\nPart of the Con
	densed Matter Theory Seminar Series.\n\nAbstract:The properties of charge c
	arriers in ideal graphene system are governed by a number of\nsymmetries\, 
	including time-reversal symmetry\, inversion symmetry\, and particle-hole s
	ymmetry.\nIn a realistic setting\, some or all of these symmetries can be n
	aturally broken: magnetic\nfield breaks time-reversal symmetry\, strain of 
	the graphene sheet breaks the inversion\nsymmetry\, while the particle-hole
	 symmetry is broken by Coulomb interactions and free-particle\neffects such
	 as the next-nearest-neighbor hopping. Such symmetry breaking can\nlead to 
	energy splitting of the two valleys. We show that the resulting imbalance o
	f the Hall\nconductivities leads to valley-Hall effect\, similar to the spi
	n-Hall effect\, but with the valley\nplaying the role of spin. In the regim
	e of slow inter-valley relaxation\, the valley-Hall effect\nmanifests itsel
	f in non-local charge transport. Remarkably\, the non-local response can oc
	cur\nin both classical and quantized Hall transport regimes. We show that t
	he nonlocal response\ncan be used as a diagnostic for different types of sy
	mmetry breaking at the Dirac point.\nIn addition\, our study provides an ex
	planation of recent experiments of Manchester group\,\nin which pronounced 
	non-locality of transport in macroscopic graphene samples subject to\nmagne
	tic field has been observed.
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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