Abstract
Initial phase shift in a precessional motion of resident electron-spin polarization is studied in a single quantum well using a time-resolved Kerr rotation technique. The generation dynamics of resident electron-spin polarization involve the formation and transformation of the associated optically excited states and are complicated particularly in the early time region. A careful analysis of the phase shift gives a deep understanding of the generation processes. In the experiments, the negative phase shift of the resident electron-spin polarization is observed, and the mechanism associated especially with a quick hole spin flip in negative trions is studied through the dependences on excitation power and magnetic field strength.
- Received 17 August 2014
- Revised 14 October 2014
DOI:https://doi.org/10.1103/PhysRevB.90.205307
©2014 American Physical Society