Figure 1From: Direct measurement of the spin gaps in a gated GaAs two-dimensional electron gasMagnetoresistance measurements R xx ( B ) at V g = -0.08 V for sample A at T = 0.3 K. The maxima in R xx occur when the Fermi energy lies in the n th spin-split Landau levels as indicated by n = 3↓ and n = 3↑, n = 2↓ and n = 2↑, and n = 1↓ and n = 1↑, respectively.Back to article page