Abstract
Acknowledging the finite size of the nucleus in a Rydberg atom subjected to a magnetic field introduces an additional term into the Hamiltonian. Though often neglected or negligible in atoms, this term, which produces the motional Stark effect, may be important, e.g., in the solid state to an exciton interacting with a strong magnetic field. The consequences of this term in the problem of a two-dimensional Rydberg atom or exciton in crossed external electric and magnetic fields are investigated. A rich dynamics is uncovered: depending on the mass ratio and external field strengths, new types of internal motion may arise as compared to the dynamics possible in the infinite nuclear mass approximation.
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