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The phase of quantum magneto-oscillations is often associated with the Berryphase and is widely used to argue in favor of topological nontriviality of thesystem (Berry phase $2\pi n+\pi$). Nevertheless, the experimentally determinedvalue may deviate from $2\pi n+\pi$ arbitrarily, therefore more care should bemade analyzing the phase of magneto-oscillations to distinguish trivial systemsfrom nontrivial. In this paper we suggest two simple mechanisms dramaticallyaffecting the experimentally observed value of the phase in three-dimensionaltopological insulators: (i) magnetic field dependence of the chemicalpotential, and (ii) possible nonuniformity of the system. These mechanisms arenot limited to topological insulators and can be extended to othertopologically trivial and non-trivial systems.

Simple mechanisms that impede the Berry phase identification from magneto-oscillations