Distinctive fluctuations in a confined geometry |
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Authors: | Degawa M Stasevich T J Cullen W G Pimpinelli Alberto Einstein T L Williams E D |
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Institution: | Department of Physics, University of Maryland, College Park, Maryland 20742-4111 USA. mdegawa44@hotmail.com |
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Abstract: | Spurred by recent theoretical predictions Phys. Rev. E 69, 035102(R) (2004)10.1103/PhysRevE.69.035102; Surf. Sci. Lett. 598, L355 (2005)10.1016/j.susc.2005.09.023], we find experimentally using STM line scans that the fluctuations of the step bounding a facet exhibit scaling properties distinct from those of isolated steps or steps on vicinal surfaces. The correlation functions go as t0.15 +/- 0.03 decidedly different from the t0.26 +/- 0.02 behavior for fluctuations of isolated steps. From the exponents, we categorize the universality, confirming the prediction that the nonlinear term of the Kardar-Parisi-Zhang equation, long known to play a central role in nonequilibrium phenomena, can also arise from the curvature or potential-asymmetry contribution to the step free energy. |
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