Abstract
The Coulomb correlation of a remote electron separated from a two-dimensional electron system (2DES) is studied in the presence of a magnetic field applied perpendicular to the 2DES. The polarization produced by the remote electron is described as the excitation of virtual plasmons in the 2DES. The resulting composite quasi-particle, electron + polarization, is therefore called a plasmon polaron. The ground state energy of this quasi-particle is calculated using second-order perturbation theory and the results are related to recent resonant tunneling experiments. Qualitative agreement of the shift in the resonant tunneling peak with magnetic field is obtained.