Nuclear Spin Orientation Dependence of Magnetoconductance: A New Method for Measuring the Spin of Charged Excitations in the QHE;Physical Review Letters

摘要

A new method for measuring the spin of the electrically charged ground state excitations m the quantum Hall effect is proposed and demonstmted for the tirst time in GaAs/AIGaAs nndtiquantum wells. The method is based on the nuclear spin orientation dependence of the 2D dc conductivity y in the quantum Hall regime due to the nuclear hyperfine interaction. As a demonstration of this method the spin of the electrically charged excitations of the ground state is determined at filling factor v = 1.