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We observe a strong modulation of the low temperature in-plane conductance G_∥ of coupled quantum wells (QW's) by an in-plane magnetic field B_∥ and attribute this to an anticrossing of the two QW dispersion curves. The anticrossing produces a partial energy gap, yielding large, B_∥-tunable distortions in the Fermi surface and density of states. Sweeping B_∥ moves the energy gap through the Fermi level, with the upper and lower gap edges producing a sharp maximum and minimum in G_∥, in agreement with theoretical calculations. The gap energy is directly determined from the data.
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Simmons et al. (1994) studied this question.
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