  We investigate effects of electron-electron interaction on the transmission
probability of electrons through a tunnel junction in a strong magnetic field.
We start with the Hartree-Fock approximation, and we show that the coulomb
interaction, which gives rise to the divergence of Fock correction, should be
replaced by the dynamically screened interaction. We also show that we should
use the bare coulomb interaction for Hartree term. We take into account higher
order contributions using a simple renormalization group approach. The
temperature dependence of the transmission probability is qualitatively similar
to that of a one-dimensional system.
