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SUMMARY:On the origin of quantum many-body scars
DTSTART:20191205T140000
DTEND:20191205T153000
DTSTAMP:20260930T202306Z
UID:d22d020b5e090b1b2af05b64396dd9ad4235bb9a367f2a1ae2ab5aa4
CATEGORIES:Conferences - Seminars
DESCRIPTION:Markus Müller\nThe recent observation of long time oscillatio
 ns in the dynamics of a highly excited state of  50 Rydberg atoms has spu
 rred a lot of interest. This surprisingly defies the natural hypothesis th
 at interacting systems should internally thermalize on fast time scales\, 
 and thus kill any coherent oscillation. This phenomenon is reminiscent of 
 "scars" known to occur in quantum billiards\, where single particle wavefu
 nctions retain strong traces of periodic classical orbits\, which ensures 
 the long time persistence of periodic motion of suitably prepared quantum 
 wavepackets. \n\nWhile interesting recent work has elucidated various asp
 ects of the exceptional dynamics in quantum many-body chains\, their poten
 tial connection with single particle scars has remained obscure. Here I wi
 ll show that the quasiperiodic quantum dynamics can be understood as a rem
 nant of an entire family of extraordinarily stable periodic orbits in the 
 semiclassical limit of the many body spin chains.\n 
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727
STATUS:CONFIRMED
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