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Energy gaps of the two-dimensional electron gas explored with equilibrium tunneling spectroscopy.

We detail our results revealing a new energy gap present in the two-dimensional electron gas (2DEG). The gap, seen in the tunneling spectrum of electrons in the 2DEG, develops only in the presence of a magnetic beld applied perpendicular to the 2DEG plane. The experiments discussed here consist of measurements of electron tunneling between a 2DEG in a quantum well and an n + substrate using excitation voltages less than k B T/e. At low temperatures and only with the magnetic field applied perpendicular to the plane of the electron gas in the well, the tunneling rate develops an unusual temperature-dependent suppression. The suppression strength is roughly independent of Landau-level filling for densities 0.5×10 11 cm -2 to 6×10 11 cm -2