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SURFACE RELAXATION MECHANISMS IN THE MORPHOLOGICAL EQUILIBRATION OF CRYSTAL SURFACES
 

Summary: SURFACE RELAXATION MECHANISMS IN THE MORPHOLOGICAL
EQUILIBRATION OF CRYSTAL SURFACES
Jonah D. Erlebacher *, Michael J. Aziz *
*Division of Applied Sciences, Harvard University, Cambridge, MA 02138,
jonah@matsci.harvard.edu
ABSTRACT
The phenomenology of surface relaxation below the roughening temperature TR is
shown via kinetic Monte Carlo simulation to exhibit extremely non-classical behavior
depending on (1) initial morphology and (2) kinetic rate laws for atom motion. However,
within the temperature and size scale of our simulations there are several different
mechanisms that operate. The "pinch-off" mechanism is seen to be operative for ripple
relaxation employing i-kinetics. For ripple relaxation employing i-kinetics, pinch-off is
seen at short times. At long times, these particular surfaces spontaneously island, and
then reduction of line tension drives relaxation. Reduction of line tension also drives
relaxation of dimpled surfaces.
INTRODUCTION
Roughened crystalline surfaces above the surface roughening temperature TR evolve
to flatness in such a way that features of spatial frequency q decay in amplitude
exponentially in time with time constant proportional to q-4
[1]. The behavior of surfaces

  

Source: Aziz, Michael J.- School of Engineering and Applied Sciences, Harvard University

 

Collections: Physics; Materials Science