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We determine the density-dependent electron mass, m*, in two-dimensional (2D)electron systems of GaAs/AlGaAs heterostructures by performing detailedlow-temperature Shubnikov deHaas measurements. Using very high qualitytransistors with tunable electron densities we measure m* in single, highmobility specimens over a wide range of r_s (6 to 0.8). Toward low-densities weobserve a rapid increase of m* by as much as 40%. For 2>r_s>0.8 the mass valuesfall ~10% below the band mass of GaAs. Numerical calculations are inqualitative agreement with our data but differ considerably in detail.Comment: to be published in Physical Review Letter

physical review letters

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Measurements of the Density-Dependent Many-Body Electron Mass in Two DimensionalGaAs/AlGa