Coulomb pseudogap in scattering-assisted tunneling of electrons between Landau-quantized two-dimensional electron gases

We investigate electron tunneling between two GaAs accumulation two-dimensional layers separated by an (AlGa)As barrier which is modulation-doped with donors. A Coulomb pseudogap suppresses electron tunneling at the Fermi level and is induced by a magnetic field applied perpendicular to the accumulation layers. By measuring the tunnel current as a function of magnetic field and bias voltage, we examine how the pseudogap is influenced by elastic scattering processes.