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VERSION:2.0
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CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20261017T124122Z
LAST-MODIFIED:20191025T181547Z
DTSTART:20191025T160000Z
DTEND:20191025T170000Z
UID:event2219@bu.edu
URL:http://physics.bu.edu/internal/events/show/2219
SUMMARY:Floquet analysis of a quantum system with modulated periodic drivin
	g
DESCRIPTION:Featuring Viktor Novicenko \, Institute of Theoretical Physics 
	and Astronomy Vilnius University\n\nPart of the Condensed Matter Theory Sem
	inar Series.\n\nWe consider a quantum system periodically driven with a str
	ength which\nvaries slowly on the scale of the driving period. The analysis
	 is based on a\ngeneral formulation of the Floquet theory relying on the ex
	tended Hilbert\nspace. It will be shown that the dynamics of the system can
	 be described in\nterms of a slowly varying effective Floquet Hamiltonian t
	hat captures the\nlong-term evolution\, as well as rapidly oscillating micr
	omotion operators.\nWe obtain a systematic high-frequency expansion of all 
	these operators. As\nan illustration of the importance of slowly varying pa
	rameters\, we consider\na quantum-mechanical spin in an oscillating magneti
	c field with a slowly\nchanging direction. The effective evolution of the s
	pin is then associated\nwith non-Abelian geometric phases reflecting the ge
	ometry of the extended\nFloquet space.\n\n[1] Phys. Rev. A 95\, 023615 (201
	7)\n[2] Phys. Rev. A 100\, 012127 (2019)\n[3] arXiv:1908.11275
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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