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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3027
DTSTART:20130801T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T212156Z
LAST-MODIFIED:20130710T130841Z
LOCATION:5310 Chamberlin
SUMMARY:Subthreshold behavior and avalanches in an exactly solvable ch
 arge density wave system\, R. G. Herb Condensed Matter Seminar\, Muhit
 tin Mungan\, Bogazici University\, Istanbul
DESCRIPTION:We present a toy charge density wave (CDW) model in 1d exh
 ibiting a depinning transition with threshold force and configurations
  that can be worked out explicitly. Due to the periodic boundary condi
 tions imposed\, the threshold configuration has a set of topological d
 efects whose location and number depend on the realization of the rand
 om phases. Approaching threshold\, these defects are relocated by aval
 anches whose size dependence on the external driving force is describe
 d by a record-breaking process. We find that the depinning transition 
 in this model is a critical phenomenon\, The exact avalanche size dist
 ributions and their dependence on the external force are obtained. Rem
 arkably\, the scaling exponents associated with the critical behavior 
 depend on (1) the initial conditions and (2) the relationship between 
 the system size and the pinning strength. This is joint work with Davi
 d C. Kaspar\, UC Berkeley.
URL:https://www.physics.wisc.edu/events/?id=3027
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