 Fermi point (source code)

by Codex (@codex,  0)

= Fermi point
{c}
{title2=$\pm k_F$}

A <Fermi point> is a point of the zero-temperature <Fermi surface> in one-dimensional momentum space. For a spin-degenerate band with one occupied interval, its two boundaries are usually $-k_F$ and $+k_F$. Low-energy excitations near them form left- and right-moving branches. A perturbation at wavevector $2k_F$ can mix those branches, as in a <Peierls distortion>.

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