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DTSTAMP:20261002T183215Z
LAST-MODIFIED:20150303T143433Z
DTSTART:20150311T150000Z
DTEND:20150311T160000Z
UID:event1420@bu.edu
URL:http://physics.bu.edu/internal/events/show/1420
SUMMARY:Transient Orthogonality Catastrophe in a Time Dependent Nonequilibr
	ium Environment
DESCRIPTION:Featuring Dr. Marco Schiro'\, Institut de Physique Théorique (
	IPhT)\, Saclay France.\n\nPart of the Condensed Matter Theory Seminar Serie
	s.\n\nAbstract:\nWe study the response of highly-excited time dependent qua
	ntum many-body\nstates to sudden local perturbations\, a sort of orthogonal
	ity catastrophe\nproblem in  transient non-equilibrium environments. As a k
	ey quantity we\nlook at the overlap between time dependent wave-functions i
	n presence or\nabsence of the local potential\, that we write as a novel tw
	o-time\ncorrelation function generalizing the standard Loschmidt Echo. We p
	resent\nexplicit calculations for one dimensional fermions excited by a sud
	den\nchange of the interaction and perturbed by the switching on of a local
	\nstatic potential. Our results reveal an intermediate time regime where th
	e\ntwo-time Loschmidt Echo features power law decay and aging. On longer ti
	me\nscales the interplay between non equilibrium excitation of bulk modes a
	nd\nlocal nonlinearity generates an exponential decay in time of the Echo\,
	\nreminiscent of an effective thermal behavior. We discuss possible\nexperi
	mental signatures of this quench-induced decoherence effect both in\ntransp
	ort and in dynamics using non-equilibrium Ramsey interferometry\nschemes.\n
	\nRefs:\nM. Schiro'\, A. Mitra Phys. Rev. Lett. 112\, 246401 (2014)\nM. Sch
	iro'\, A. Mitra\, arXiv:1502.06538
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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