  Based on the recently proposed concept of effective gauge potential and
magnetic field for photons, we numerically demonstrate a photonic de Haas-van
Alphen effect. We show that in a dynamically modulated photonic resonator
lattice exhibiting an effect magnetic field, the trajectories of the light beam
at a given frequency have the same shape as the constant energy contour for the
photonic band structure of the lattice in the absence of the effective magnetic
field.
