Abstract
A new method for measuring the spin of the electrically charged ground-state excitations in the quantum Hall effect is proposed and demonstrated for the first time for GaAs/AlGaAs multiquantum wells. The method is based on the nuclear spin-orientation dependence of the two-dimensional direct-current conductivity in the quantum Hall regime due to the nuclear hyperfine interaction. We use this method to determine the spin of the electrically charged excitations of the ground state at filling factor = 1.
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