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Energy gap
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<p>In <a href="/facts/Solid-state_physics/Cmc6hvyR">solid-state physics</a>, an energy gap or <a href="/facts/Band_gap/IjIeh95l">band gap</a> is an energy range in a <a href="/facts/Solid/hj5UsXno">solid</a> where no <a href="/facts/Electron/L0KBo5cW">electron</a> states exist, i.e. an energy range where the <a href="/facts/Density_of_states/bwVTyhTf">density of states</a> vanishes. </p><p>Especially in <a href="/facts/Condensed_matter_physics/EBVI5nmL">condensed matter physics</a>, an energy gap is often known more abstractly as a <a href="/facts/Spectral_gap_(physics)/GTehmEg1">spectral gap</a>, a term which need not be specific to electrons or solids. </p>