By applying a magnetic field perpendicular to GaAs/AlGaAs two-dimensional electron systems, we study the low-field Landau quantization when the thermal damping is reduced with decreasing the temperature. Magneto-oscillations following Shubnikov-de Haas (SdH) formula are observed even when their amplitudes are so large that the deviation to such a formula is expected. Our experimental results show the importance of the positive magneto-resistance to the extension of SdH formula under the damping induced by the disorder.
@article{arxiv.cond-mat/0610805,
title = {Experimental Studies of Low-field Landau Quantization in Two-dimensional Electron Systems in GaAs/AlGaAs Heterostructures},
author = {Jing-Han Chen and D. R. Hang and C. F. Huang and Tsai-Yu Huang and Jyun-Ying Lin and S. H. Lo and J. C. Hsiao and Ming-Gu Lin and M. Y. Simmons and D. A. Ritchie and C. -T. Liang},
journal= {arXiv preprint arXiv:cond-mat/0610805},
year = {2015}
}