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qcl:advanced_settings [2022/03/30 16:18] thomas.grange |
qcl:advanced_settings [2022/03/30 16:36] (current) thomas.grange [Definition of graded alloy and graded interfaces] |
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| </Layer> | </Layer> | ||
| </code> | </code> | ||
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| + | === Graded interfaces === | ||
| + | |||
| + | To specify a grading for all the interfaces of the structure, the following command ''<InterfaceWidth>'' has to be included in the ''<Interface_Roughness>'' section. | ||
| + | <code> | ||
| + | <Interface_Roughness> | ||
| + | <InterfaceWidth unit="nm">0.8</InterfaceWidth> | ||
| + | ... | ||
| + | </Interface_Roughness> | ||
| + | </code> | ||
| + | In this case, the alloy profile of the all strucure is convoluted by a Gaussian. For a well defined interface, this results in an error function profile of the form: | ||
| + | $$ | ||
| + | c(z) = c_0 + d_0 \text{erf} \left[2 | ||
| + | \sqrt{ln(2)}(z − z_0)/L \right] | ||
| + | $$ | ||
| + | where $L$ is the quantity specified in ''<InterfaceWidth>''. | ||
| ==== Scattering processes ==== | ==== Scattering processes ==== | ||
qcl/advanced_settings.1648657133.txt.gz · Last modified: 2022/03/30 16:18 by thomas.grange
