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Exchange enhancement of the Landau-level separation of up to 30% has been observed in three high mobility GaAs/Ga1-xAlxAs single heterojunctions. Analysis of the amplitude of Shubnikov-de Haas oscillations as a function of temperature and magnetic field has allowed measurement of this enhancement at filling factors as high as nu = 100

physical review. b, condensed matter

Exchange enhancement of the Landau-level separation for two-dimensional electrons in GaAs/<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow…

Exchange enhancement of the Landau-level separation for two-dimensional electrons in GaAs/Ga1−x