We study the regularity of stationary and time-dependent solutions to strong
perturbations of the free Schrödinger equation on two-dimensional flat tori. This is
achieved by performing a second microlocalization related to the size of the
perturbation and by analyzing concentration and nonconcentration properties at this
new scale. In particular, we show that sufficiently accurate quasimodes can only
concentrate on the set of critical points of the average of the potential along closed
geodesics.
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