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On the Novikov problem for superposition of periodic potentials
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We consider the Novikov problem, namely, the problem of describing the level lines of quasiperiodic functions on the plane, for a special class of potentials that have important applications in the physics of two-dimensional systems. Potentials of this type are given by a superposition of periodic potentials and represent quasiperiodic functions on a plane with four quasiperiods. Here we study an important special case when the periodic potentials have the same rotational symmetry. In the generic case, their superpositions have ``chaotic'' open level lines, which brings them close to random potentials. At the same time, the Novikov problem has interesting features also for ``magic'' rotation angles, which lead to the emergence of periodic superpositions.
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On the Novikov problem for dihedral symmetry potentials
Any smooth quasiperiodic potential with dihedral symmetry D_n (n≥3) and any number of quasiperiods has open level lines at a single energy value at most.
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