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Drift 와 결함이 있는 계의 표면 거칠기

제 13 차 열 및 통계물리 워크샵. Drift 와 결함이 있는 계의 표면 거칠기. Sooyeon Yoon & Yup Kim Department of Physics, Kyung Hee University. Background of this study. • G. Pruessner (PRL 92, 246101 (2004)). v : drift velocity. with Fixed Boundary Condition (FBC). Anomalous exponents. • Edward-Wilkinson Eq.

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Drift 와 결함이 있는 계의 표면 거칠기

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  1. 제13차 열 및 통계물리 워크샵 Drift와 결함이 있는 계의 표면 거칠기 Sooyeon Yoon & Yup Kim Department of Physics, Kyung Hee University

  2. Background of this study • G. Pruessner (PRL 92, 246101 (2004)) v : drift velocity with Fixed Boundary Condition (FBC) Anomalous exponents • Edward-Wilkinson Eq.  Surface roughness L : system size h : the height of surface  Family-Vicsek Scaling behavior EW universality class

  3. Motivation 1. What is the simple stochastic discrete surface growth model to describe the EW equaiton with drift and FBC ? • Numerical Integration • Toy models : Family model, Equilibrium Restricted Solid-On-Solid (RSOS) model …  Stochastic analysis for the Langevin equation ( S.Y. Yoon & Yup Kim, JKPS 44, 538 (2004) ) 2. Application The effect of the defect and drift for the surface growth ?

  4. A stochastic analysis of continuum Langevin equation for surface growths • Continuum Langevin Equation : is the transition rate from H′ to H. • Master Equation : If we consider the deposition(evaporation) of only one particle at the unit evolution step. (deposition) (evaporation) ( a is the lattice constant. ) S.Y. Yoon & Yup Kim, JKPS 44, 538 (2004)) • Fokker-Planck Equation :

  5. Model p x d (e ) x0=L/2 • Determine the evolution of the center point (x0=L/2) by the defect strength. • Evolution rate on the site For the Edward-Wilkinson equation with drift, d (e ) or

  6. Simulation Results (FBC, p=0)  Scaling Properties of the Surface Width (PBC, p=1)

  7.  Analysis of the Interface Profile ~

  8. Crossover (EWanomalous roughening) according to the defect strength

  9. Phase transition of RSOS model with a defect site • : H.S.Song & J.M.Kim (Sae Mulli, 50, 221 (2005)) r : the distance from the center point P : defect strength P=0, facet Pc P=1, RSOS EW p=0 p=1

  10.   slowly go out ! fast get in ! G  Application of the surface growth by the defect (Queuing problem) . ( a : lattice constant ) . . (  : particle density )

  11. Conclusion Anomalous exponents We studied the phase transition of the stochastic model which satisfies the Edward-Wilkinson equation with a drift and a defect on the 1-dimensional system. 1. The scaling exponents are changed by the drift and the perfect defect. 2. Crossover EW (p0)  Anomalous roughening (p=0) 3. Application to the queuing phenomena ( at p=0 : perfect defect ).

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