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DTSTAMP:20260816T060522Z
LAST-MODIFIED:20150917T185056Z
DTSTART:20150923T160000Z
DTEND:20150923T170000Z
UID:event1487@bu.edu
URL:http://physics.bu.edu/internal/events/show/1487
SUMMARY:Topological classification of dynamical phase transitions
DESCRIPTION:Featuring S. Vajna \, BU\nHosted by: Anatoli Polkovnikov\n\nPar
	t of the Condensed Matter Theory Seminar Series.\n\nAstract:\nDynamical pha
	se transitions (DPT) are non-equilibrium phenomena occurring in systems fol
	lowing a quantum quench\, and are characterized by nonanalytical time evolu
	tion of the dynamical free energy. First I introduce DPTs in the context of
	 spin chains with particular focus on the quantum XY chain. Afterwards I ge
	neralize the problem for general 2-band systems in one and two dimensions (
	eg. SSH model\, Kitaev-chain\, Haldane model\, p+ip superconductor\, etc.)\
	, where we showed that the time evolution of the dynamical free energy is c
	rucially affected by the ground state topology of both the initial and fina
	l Hamiltonians\, implying DPTs when the topology is changed under the quenc
	h. The singularities of dynamical free energy in the 2D case are qualitativ
	ely different from those of the 1D case\, the cusps appear only in the firs
	t time derivative.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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