New Universality class for step bunching in the "C+-C-" model

B. Ranguelov, V. Tonchev, H. Omi, Alberto Pimpinelli

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We formulate a new (1 + 1)D step model of unstable vicinal growth. The basic assumption is that the equilibrium adatom concentrations on both sides of the step are different. We deduce equations of step motion and numerically integrate them to obtain the step positions on a discrete time set. New dynamic phenomena are observed during the bunching process. The size-scaling of the minimal interestep distance lminfor first time is obtained as lmin∼ N-1/(n+1), where N is the number of steps in the bunch and n is the exponent in the step-step repulsions law U ∼ 1/dnfor two steps placed a distance d apart.

Original languageEnglish (US)
Pages (from-to)389-394
Number of pages6
JournalComptes Rendus de L'Academie Bulgare des Sciences
Issue number4
StatePublished - Jan 1 2007


  • Scaling
  • Step bunching models
  • Universality classes
  • Vicinal surfaces

ASJC Scopus subject areas

  • General


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