Cyclotron effective mass
= Cyclotron effective mass
{title2=$m_c=\hbar^2|\partial S/\partial E|/(2\pi)$}
For a closed semiclassical orbit with <area> $S(E)$ in a plane of <wave vector> space, the <cyclotron effective mass> is defined by the displayed derivative. It need not equal the local curvature-based <band effective mass>.