Scaling exponents for kinetic roughening in higher dimensions |
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Authors: | T Ala-Nissila T Hjelt J M Kosterlitz O Venäläinen |
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Institution: | (1) Research Institute for Theoretical Physics, University of Helsinki, University of Helsinki, Siltavuorenpenger 20C, P.O. Box 9, FIN-00014, Finland;(2) Department of Electrical Engineering, Tampere University of Technology, P.O. Box 692, FIN-33101 Tampere, Finland;(3) Department of Physics, Brown University, Box 1843, 02912 Providence, Rhode Island |
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Abstract: | We discuss the results of extensive numerical simulations in order to estimate the scaling exponents associated with kinetic roughening in higher dimensions, up tod=7 + l. To this end, we study the restricted solid-on-solid growth model, for which we employ a novel fitting ansatz for the spatially averaged height correlation function¯G(t)t
2 to estimate the scaling exponent. Using this method, we present a quantitative determination of ind=3 + 1 and 4+1 dimensions. To check the consistency of these results, we also compute the interface width and determine andx from it independently. Our results are in disagreement with all existing theories and conjectures, but in four dimensions they are in good agreement with recent simulations of Forrest and Tang for a different growth model. Above five dimensions, we use the time dependence of the width to obtain lower bound estimates for. Within the accuracy of our data, we find no indication of an upper critical dimension up tod = 7 + 1. |
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Keywords: | Surface growth kinetic roughening solid-on-solid model |
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