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In real life most fractures occur at defects. Even such everyday materials as cement can have their strength increased many times by reducing the defect density within them. You'll often see claims for the incredible strength of nanostructures, but the strength is just due to the fact that these structures are free of defects. It's a lot easier to make a ...


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Graphene is also very thin. According to this article the force required to break a sheet of perfect graphene by pulling it apart in such a way that all bonds break at the same time is 42 N per meter. If the width of your tape is 1cm you would need to apply 0.42 N. It is not surprising that you were able to. Even if the sheet would be perfect, you would pull ...


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you asked this a while ago, but I found it while searching for a similar question about HEMTs of my own. @engineer's answer for your first part is good but I think I can answer both, and more fully. Hopefully it'll be of help to someone else if you're past this now. A diagram from John Davies' "Physics of Low Dimensional Semiconductors" is very helpful for ...



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