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Paper   IPM / Physic / 11546
School of Physics
  Title:   Geometrical Phase Transition on WO3 Surface
  Author(s):  A.A. Saberi
  Status:   Published
  Journal: Appl.Phys.Lett
  Vol.:  97
  Year:  2010
  Pages:   154102
  Supported by:  IPM
  Abstract:
A topographical study on an ensemble of height profiles obtained from atomic force microscopy techniques on various independently grown samples of tungsten oxide WO3 is presented by using ideas from percolation theory. We find that a continuous 'geometrical' phase transition occurs at a certain critical level-height δc below which an infinite island appears. By using the finite-size scaling analysis of three independent percolation observables i.e., percolation probability, percolation strength and the mean island-size, we compute some critical exponents which characterize the transition. Our results are compatible with those of long-range correlated percolation. This method can be generalized to a topographical classification of rough surface models.

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