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BEGIN:VEVENT
DTSTAMP:20261001T025754Z
LAST-MODIFIED:20141015T191328Z
DTSTART:20141105T160000Z
DTEND:20141105T170000Z
UID:event1337@bu.edu
URL:http://physics.bu.edu/internal/events/show/1337
SUMMARY:Dynamical preparation of Floquet Chern insulators: A no-go theorem 
	and the experiments
DESCRIPTION:Featuring Dr. Luca D'Alessio\, Penn State University & Boston U
	niversity\nHosted by: Anatoli Polkovnikov\n\nPart of the Condensed Matter T
	heory Seminar Series.\n\nAbstract: Recently\, it has been proposed that tim
	e-periodic perturbations can induce topological properties in otherwise non
	-topological materials\, opening the exciting possibility of studying non-e
	quilibrium topological transitions. Here we address what should happen in a
	n experiment when one turns on the periodic driving. On the one hand\, for 
	infinite (translationally invariant) systems we prove a no-go theorem. We s
	how that the Chern number is conserved under unitary evolution\, i.e.\, it 
	is impossible to change the topological character of the initial wavefuncti
	on. On the other hand\, for systems with boundaries\, we show that the prop
	erly defined topological invariant\, the Bott index\, can change and it is 
	possible to dynamically prepare a topological wavefunctions starting from a
	 non-topological one.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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