Quantum-classical transitions in Lifshits tails with magnetic fields

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We consider Lifshits' model of a quantum particle subject to a repulsive Poissonian random potential and address various issues related to the influence of a constant magnetic field on the leading low-energy tail of the integrated density of states. In particular, we propose the magnetic analog of a 40 -year-old landmark result of Lifshits for short-ranged single-impurity potentials U. The Lifshits tail is shown to change its character from purely quantum, through quantum-classical, to purely classical with increasing range of U. This systematics is explained by the increasing importance of the classical fluctuations of the particle's potential energy in comparison to the quantum fluctuations associated with its kinetic energy.