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# Illustration Fermi sphere in k-space with the Fermi wave vector as radius

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Three-dimensional k-space $$(k_{\text x}, k_{\text y}, k_{\text z})$$ with drawn in Fermi wave vector $$\boldsymbol{k}_{\text F}$$ as radius of a Fermi sphere. The Fermi wave vector determines the Fermi energy of a free electron gas.