Abstract
Time‐resolved Kerr rotation (TRKR) Spectroscopy has been applied to a two‐dimensional (2D) electron gas in GaAs/AlGaAs hetero‐junction to probe the electron and nuclear spin dynamics in quantum Hall regime. A large and long‐lasting Kerr rotation signal was ascribed to the high‐mobility 2D‐electron gas, since the Kerr signal from etched high purity GaAs substrate was much smaller and shorter. In a configuration where an out‐of‐plane magnetic field quantizes 2D‐electrons into Landau levels, the spin coherence time, T2* exhibits a drastic increase. Furthermore, both T2* and effective g factor exhibit an oscillation behavior as a function of the magnetic field. Under a circularly polarized pump, we observed an Overhauser shift up to 40 μeV, which corresponds to 30 % dynamic nuclear polarization (DNP).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
