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SUMMARY:Depinning free of the elastic approximation
DTSTART:20240116T140000
DTEND:20240116T143000
DTSTAMP:20260924T115213Z
UID:8583e2b9184b7ea38ac1f7f4bbde46399d413b687f2a22556de08837
CATEGORIES:Conferences - Seminars
DESCRIPTION:Alejandro B.Kolton (Centro Atómico Bariloche and Instituto Ba
 lseiro\, Bariloche\, Argentina)  \nWe model the isotropic depinning trans
 ition of a domain wall using a two-dimensional Ginzburg-Landau\nscalar fie
 ld instead of a directed elastic string in a random media. An exact algori
 thm accurately targets\nboth the critical depinning field and the critical
  configuration for each sample. For random bond disorder\nof weak strength
 \, the critical field scaling with disorder is in agreement with the predi
 ctions for the\nquenched Edwards-Wilkinson elastic model. However\, critic
 al configurations display overhangs beyond a\ncharacteristic length l0 tha
 t diverges only when the disorder vanishes\, indicating a finite-size cros
 sover. At\nlarge scales\, overhangs recover the orientational symmetry whi
 ch is broken by directed elastic interfaces.\nWe obtain quenched Edwards-W
 ilkinson exponents below l0 and invasion percolation depinning\nexponents 
 above l0. A full picture of domain-wall isotropic depinning in two dimensi
 ons is hence proposed.
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727
STATUS:CONFIRMED
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