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A non-planar two-dimensional electron gas (2DEG) has been realised by using molecular beam epitaxy to grow a high mobility heterostructure on a (100) n + -GaAs layer selectively etched to create a two-dimensional array of cavities through the n + -GaAs which are bounded by higher-index facets. Far-infrared (FIR) cyclotron resonance spectra show one absorption mode associated with an...
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