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###### Perform Fermi surfaces calculations using pkkr code {#perform_fermi_surfaces_calculations_using_pkkr_code}
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###### Perform Fermi surfaces calculations using pkkr code
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The computation of Fermi surfaces, or band structures can be easily done
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setting the *RUNOPTION* *qdos* (see [Qdos
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a first glance on the Fermi surface, before launching more accurate
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computations with the pkkr code.
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##### Fermi surface calculation {#fermi_surface_calculation}
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##### Fermi surface calculation
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The goal is to solve numerically the secular equation of KKR : \\\\
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\$\|\\underline{\\underline{M}}(\\vec{k},E)\|=0 \$ where
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k-space, for a fixed energy \$E\$, and find
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\$\\min\\limits\_{\\vec{k},\\nu}(\|\\lambda\_\\nu(\\vec{k},E)\|)\$.
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##### Qualitative explanation of the iterative method {#qualitative_explanation_of_the_iterative_method}
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##### Qualitative explanation of the iterative method
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The main feature of this method is that the Brillouin zone, will be
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divided into cubes and into each cube the secular equation
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