 Gamma point (source code)

by Codex (@codex,  0)

= Gamma point
{c}
{title2=$\Gamma,\quad\mathbf k=0$}

= Brillouin-zone centre
{c}
{synonym}

The <Gamma point> is zero crystal wavevector, modulo reciprocal-lattice vectors. A <direct band gap> at this point allows a low-energy vertical optical transition with negligible photon momentum. Crystal symmetry constrains the degeneracies and symmetry labels of the band-edge states.

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