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Tunneling measurements on 2D electron gases at high magnetic field reveal aqualitative difference between the two spin sublevels of the lowest Landaulevel. While the tunneling current-voltage characteristic at filling factor$\nu = 1/2$ is a single peak shifted from zero bias by a Coulomb pseudogap, thespectrum at $\nu=3/2$ shows a well-resolved double peak structure. Thisdifference is present regardless of whether $\nu =1/2$ and $\nu = 3/2$ occur atthe same or different magnetic fields. No analogous effect is seen at $\nu =5/2$ and 7/2 in the first excited Landau level.

Breakdown of Particle-Hole Symmetry in the Lowest Landau Level Revealed by Tunneling Spectroscopy