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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20260814T101158Z
LAST-MODIFIED:20191010T133655Z
DTSTART:20191009T193000Z
DTEND:20191009T203000Z
UID:event2209@bu.edu
URL:http://physics.bu.edu/internal/events/show/2209
SUMMARY:Topological classes of quantum dynamics in quasi-periodically drive
	n systems
DESCRIPTION:Featuring Phil Crowley\, Boston University\n\nPart of the Conde
	nsed Matter Theory Seminar Series.\n\nAdvances in the control and manipulat
	ion of experimental quantum systems has allowed us to realise new driven ph
	ases of quantum matter in the laboratory. In periodically driven systems ne
	w phases occur when the steady states\, determined by Bloch-Floquet theorem
	\, have novel spatio-temporal or topological order.\n\nIn this talk I show 
	how the Bloch-Floquet theorem is generalised to cases when the drives are n
	ot periodic\, but rather quasi-periodic.  \n\nI apply this framework to the
	 simplest case of a few level system\, and show that steady state dynamics 
	admit a topological classification. When the classification is non-trivial 
	the system exhibits a quantised pumping of energy\, and a sensitivity to in
	itial conditions\, neither of which is present in the trivial case.\n\nI fu
	rther discuss the stability of this classification\, the behaviour near the
	 critical point where the topological class changes\, and ongoing work to o
	bserve this in experiments.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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