BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3869
DTSTART:20160204T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T225345Z
LAST-MODIFIED:20160201T211641Z
LOCATION:5310 Chamberlin
SUMMARY:Dynamics of interacting disordered quantum spin systems\, R. G
 . Herb Condensed Matter Seminar\, Ivar Martin\, Argonne National Labor
 atory
DESCRIPTION:Localized paramagnetic electrons are believed to be the ca
 use of magnetic flux noise that plagues superconducting qubits\; howev
 er\, how such interacting spins generate frequency dependent noise of 
 the 1/f form is not well understood due to the complexity of the full 
 quantum mechanical treatment of interacting spin system. In this talk 
 I will describe a dynamical real space renormalization group (RG) proc
 edure that allows to calculate directly various dynamical quantities i
 n a strongly disordered Heisenberg spin systems. Using this approach w
 e generally find the dynamics that correspond to (anomalous) spin subd
 iffusion\, with a powerlaw low-frequency magnetic noise\, which appear
 s to be consistent with what is observed in superconducting circuits. 
URL:https://www.physics.wisc.edu/events/?id=3869
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