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Electrically detected electron spin resonance (EDESR) signals were acquiredas a function of temperature in the 0.3-4.2 K temperature range in aAlGaAs/GaAs multiple quantum well sample at the filling factor at 5.7 T. In theparticular sample studied, the line width is approximately temperatureindependent, while the amplitude exhibits a maximum at about 2.2 K and vanisheswith increased or decreased temperature. To explain the observed temperaturedependence of the signal amplitude, the signal amplitude temperature dependenceis calculated assuming a model based on heating. The model ascribes theresonant absorption of microwave power of the 2DES to the uniform mode of theelectron spin magnetization where the elementary spin excitations at fillingfactor are taken to be spin waves, while the short wavelength spin wave modesserve as a heat sink for the absorbed energy. Due to the finite thermalconductance to the surroundings, the temperature of the 2DES spin wave systemis increased, resulting in a thermal activation of the longitudinalmagnetoconductance. The proposed heating model correctly predicts the locationof the maximum in the experimentally observed temperature dependence of theEDESR amplitude. It also correctly predicts that the signal should vanish asthe temperature is increased or decreased. The results of the present studydemonstrate how experimental EDESR studies can, under appropriate conditions,provide data that can be used to discriminate between competing theories forthe magnetic ordering and magnetic excitations of a 2DES in the regime of thequantum Hall effect.Comment: 9 figure

physical review. b, condensed matter

Temperature dependence and mechanism of electrically detected ESR at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mn /></mml:math>filling factor of a two-dimensional electron system

Temperature dependence and mechanism of electrically detected ESR at theν=1filling factor of a two-dimensional electron system