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DTSTAMP:20260915T214745Z
LAST-MODIFIED:20130513T145104Z
DTSTART:20130522T180000Z
DTEND:20130522T190000Z
UID:event1115@bu.edu
URL:http://physics.bu.edu/internal/events/show/1115
SUMMARY:Topological Entropy after a Quantum Quench
DESCRIPTION:Featuring Alioscia Hamma\, Perimeter Institute for Theoretical 
	Physics\nHosted by: Claudio Chamon\n\nPart of the Condensed Matter Theory S
	eminar Series.\n\nAbstract:  We study the time evolution of a topologically
	 ordered\nstate after a Quantum Quench (QQ). We prepare the system in the g
	round\nstate of the toric code and then suddenly switch on\nan external mag
	netic field. We study two QQs\, one integrable and one\nnon-integrable. In 
	the first case\, we give an exact treatment for the\ntime evolution\, while
	 in the second one we resort to perturbation\ntheory. We are interested in 
	the notion of topological order away from\nequilibrium. To this goal\, we u
	se the topological part of the 2-Renyi\nentropy of the reduced state. We sh
	ow that for both QQs\, the topological\nentropy is resilient at large times
	\, regardless of integrability. We\nargue that in order to disrupt topologi
	cal order\, the QQ needs also to\nbreak the gauge symmetry of the Hamiltoni
	an.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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