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DTSTAMP:20261023T233947Z
LAST-MODIFIED:20201123T194947Z
DTSTART:20201118T140000Z
DTEND:20201118T150000Z
UID:event2379@bu.edu
URL:http://physics.bu.edu/internal/events/show/2379
SUMMARY:Theory of anomalous Floquet higher-order topology
DESCRIPTION:Featuring Zhicheng Yang\, Univ. of Maryland\n\nPart of the Biop
	hysics/Condensed Matter Seminar Series.\n\nIn this talk\, I will present a 
	general framework to understand\ntwo dimensional "anomalous Floquet higher-
	order topological insulators"\n(AFHOTIs) protected by point group symmetrie
	s. Such AFHOTIs are defined\nby their robust\, symmetry-protected corner mo
	des pinned at special\nquasienergies\, even though all their Floquet bands 
	carry trivial band\ntopology. I will show that the nontrivial topology can 
	be diagnosed from\nthe phase spectrum of the full time-evolution operator w
	ithin one\nperiod\, instead of the quasienergy bands at stroboscopic times 
	only. In\nparticular\, the phase spectrum of AFHOTIs features robust 3D Dir
	ac/Weyl\nlike singularities\, which cannot be removed without closing the\n
	quasienergy gap or breaking the point group symmetry. I will further\ndemon
	strate the higher-order bulk-boundary correspondence for AFHOTIs\nusing dim
	ensional reduction. This allows for a systematic classification\nof 2D AFHO
	TIs protected by rotation and dihedral groups
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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