= Transverse magnetic focusing
{title2=$B_j=2j\hbar k_F/(eL)$}
= Electron focusing
{synonym}
A <magnetic field> curves ballistic carrier trajectories between an injector and a collector. For openings separated along a specular edge by $L$, peaks occur near $L=2jr_c$ with $r_c=\hbar k_F/(e|B|)$, giving $|B_j|=2j\hbar k_F/(eL)$. Field polarity and carrier sign select the connection direction. <Electron phase coherence> can produce fine structure but is not required for the basic semiclassical focusing geometry.
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