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Interaction of threading and misfit dislocations in a strained epitaxial layer
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14.The parameters used in our calculations are those appropriate to on Si. Specifically, unit cell dimension cm, shear modulus μ=0.34 and Poisson ratio θ=0.234. Our conclusions are not sensitive to these values. The strain is related to the Ge concentration by although we have framed our discussion in terms of response to a positive strain.
15.We have also performed calculations for the case in which an image D2′ of D2 is placed in the upper interface, this being a closer approximation to the free-surface problem. The strain required to drive D1 past D2, D2′ is only about three percent greater than that needed to drive D1 past D2 alone.
16.J.-C. Ramirez, A. Bower, and L. B. Freund have performed some preliminary calculations in which the shape of D1 is allowed to vary (unpublished).
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