Recent content by iansullivan88

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    Graduate Fermi Energy & Optical Transitions

    I found an answer now. It was to do with band structure. Thanks for trying to help. Ian
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    Graduate Fermi Energy & Optical Transitions

    Hello, I have a question which has something to do with band structures etc: A two dimensional solid has two electrons per unit cell. The crystal potential is weak and the solid behaves like a free electron metal. Estimate the threshold for interband optical transitions in terms of the...
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    Graduate Solving Confusion with Summation Convention - Ian

    Ah I see - thanks very much Ian
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    Graduate Solving Confusion with Summation Convention - Ian

    Hello, I think I am fundamentally confused with summation convention. For example, if I have \epsilon_{ijk}x_j\delta_{jk} Can I sift the levi civita and get \epsilon_{ijj}x_j=0 or sift x and get \epsilon_{ijk}x_k\not=0 Each gives a different answer. What mistake...