Control of Electron Spin Coherence Using Landau Level Quantization in a   Two-Dimensional Electron Gas
  Time-resolved optical measurements of electron spin dynamics in modulation doped InGaAs quantum wells are used to explore electron spin coherence times and spin precession frequencies in a regime where an out of plane magnetic field quantizes the states of a two-dimensional electron gas into Landau levels. Oscillatory features in the transverse spin coherence time and effective g-factor as a function of applied magnetic field exhibit a correspondence with Shubnikov-de Haas oscillations, illustrating a coupling between spin and orbital eigenstates. We present a theoretical model in which inhomogeneous dephasing due to the population of different Landau levels limits the spin coherence time and captures the essential experimental results. 
V. Sih, W. H. Lau, R. C. Myers, A. C. Gossard, M. E. Flatt\'e, D. D.   Awschalom