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DTSTAMP:20260908T141321Z
LAST-MODIFIED:20161122T195347Z
DTSTART:20161128T200000Z
DTEND:20161128T210000Z
UID:event1687@bu.edu
URL:http://physics.bu.edu/internal/events/show/1687
SUMMARY:Equilibration in the many-body localized phase
DESCRIPTION:Featuring Alioscia Hamma\, University of Massachusetts Boston\n
	\nPart of the Condensed Matter Theory Seminar Series.\n\nWe study the dynam
	ics after a sudden quench of quantum states evolving under an isotropic Hei
	senberg spin-1/2 Hamiltonian with disordered couplings. This system exhibit
	s a ETH-MBL transition for strong enough disorder. We show that the slow dy
	namics of MBL has profound consequences on its equilibration behaviour and 
	properties. Namely\, that one cannot describe the long time behaviour of su
	ch states using a diagonal ensemble of eigenstates. We investigate the beha
	viour away from equilibrium using fidelity\, Loschmidt Echo\, purity and in
	verse participation ratio and notions like scrambling time. Moreover\, we s
	how that the dynamical exponents governing these phenomena are different in
	 the ETH and MBL phase and that the scaling behaviour detects the transitio
	n. Since ground states of ETH and MBL phases are not easily distinguishable
	\, we argue that the ETH-MBL transition is indeed a dynamical phase transit
	ion.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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