Periodic envelope of Coulomb-blockade oscillations in the quantum Hall regime

The irregular envelope of Coulomb-blockade oscillations in the conductance of a quantum dot as a function of gate voltage is observed to change into a periodic modulation in quantizing magnetic fields. The period corresponds to depopulation of each of the Landau levels in the dot by a single electron, with tunneling occurring predominantly through a single edge state of the outermost Landau level. Magnetoconductance data are consistent with this interpretation, which implies that the energy spectrum has an unexpected regularity.