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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20261018T141023Z
LAST-MODIFIED:20171211T142327Z
DTSTART:20171220T160000Z
DTEND:20171220T170000Z
UID:event1873@bu.edu
URL:http://physics.bu.edu/internal/events/show/1873
SUMMARY:"Propagation of an impurity through a quantum medium"
DESCRIPTION:Featuring Mikhail Zvonarev\, LPTMS\, CNRS\, Orsay\, France\n\nP
	art of the Condensed Matter Theory Seminar Series.\n\nI will report on rece
	nt theoretical and experimental progress in understanding the dynamics of a
	n impurity particle injected into a one-dimensional quantum liquid. I will 
	show that the momentum distribution of the impurity subject to a constant e
	xternal force exhibits characteristic Bragg reflections at the edge of an e
	mergent Brillouin zone. As a consequence\, the impurity exhibits periodic d
	ynamics that is interpreted as Bloch oscillations\, which arise even though
	 the quantum liquid is translationally invariant. I will also discuss a qua
	ntum flutter phenomenon\, whose essence is that the impurity injected into 
	a liquid with some initial momentum sheds only a part of it to the backgrou
	nd gas\, and forms a correlated state that no longer decays in time; furthe
	rmore\, if the initial momentum is large enough\, the impurity undergoes lo
	ng-lived oscillations. The value of the impurity's velocity at infinite tim
	e lies between zero and the speed of sound in the gas\, and is determined b
	y the injection protocol. This way\, the impurity's frictionless motion is 
	a dynamically emergent phenomenon whose description goes beyond accounting 
	for the kinematic constraints of Landau's approach to superfluidity.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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