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Abstract: The temperature dependence of the electron spin $g$ factor in GaAs isinvestigated experimentally and theoretically. Experimentally, the $g$ factorwas measured using time-resolved Faraday rotation due to Larmor precession ofelectron spins in the temperature range between 4.5 K and 190 K. The experimentshows an almost linear increase of the $g$ value with the temperature. Thisresult is in good agreement with other measurements based on photoluminescencequantum beats and time-resolved Kerr rotation up to room temperature. Theexperimental data are described theoretically taking into account a diminishingfundamental energy gap in GaAs due to lattice thermal dilatation andnonparabolicity of the conduction band calculated using a five-level kp model.At higher temperatures electrons populate higher Landau levels and the average$g$ factor is obtained from a summation over many levels. A very gooddescription of the experimental data is obtained indicating that the observedincrease of the spin $g$ factor with the temperature is predominantly due toband-s nonparabolicity.



Author: W. Zawadzki, P. Pfeffer, R. Bratschitsch, Z. Chen, S. T. Cundiff, B. N. Murdin, C. R. Pidgeon

Source: https://arxiv.org/







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