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DTSTAMP:20190824T200116Z
LAST-MODIFIED:20190813T154615Z
DTSTART:20190815T160000Z
DTEND:20190815T170000Z
UID:event2162@bu.edu
URL:http://physics.bu.edu/events/show/2162
SUMMARY:Universal features of quantum critical dynamics beyond the Kibble-Z
urek mechanism
DESCRIPTION:Featuring Adolfo del Campo\, Donostia International Physics Cen
ter\, Spain\nHosted by: Anatoli Polkovnikov\n\nPart of the Biophysics/Conde
nsed Matter Seminar Series.\n\nWhen a quantum phase transition is crossed i
n finite time\, critical slowing down leads to the breakdown of adiabatic d
ynamics and the formation of topological defects. The average density of de
fects scales with the quench rate following a universal power-law predicted
by the Kibble-Zurek mechanism. We analyze the full counting statistics of
kinks and report the exact kink number distribution in the transverse-field
quantum Ising model. Kink statistics is described by the Poisson binomial
distribution with all cumulants exhibiting a universal power-law scaling wi
th the quench rate. In the absence of finite-size effects\, the distributio
n approaches a normal one\, a feature that is expected to apply broadly in
systems described by the Kibble-Zurek mechanism. It will be argued that the
number distribution of topological defects is actually universal in any sy
stem obeying the Kibble-Zurek mechanism.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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