= Nambu spinor
{c}
{title2=$\Psi_k=(c_k,c_{-k}^\dagger)^T$}
A <Nambu spinor> groups an <annihilation operator> with an opposite-momentum <creation operator> to express pairing in a quadratic <Hamiltonian> as a matrix problem. Its components are not independent: the spinor at $-k$ is related to conjugated components at $k$. This redundancy must be accounted for when summing energies and <normal ordering> constants. Component phases are a convention and change the displayed off-diagonal matrix entries.
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