Control of Electron Spin Coherence Using Landau Level Quantization in 2DEGs
Abstract
Time-resolved optical measurements of electron spin dynamics in modulation doped InGaAs quantum wells explore electron spin coherence times and g-factors in a regime where an out of plane magnetic field quantizes the density of states of a two-dimensional electron gas into Landau levels. Unlike electrically detected electron spin resonance, measurements can be made when the Fermi energy is between Landau levels, and the electron spin coherence time can be obtained directly. Optical and transport experiments are performed on samples of varying carrier densities in a magneto-optical cryostat over a range of temperatures and magnetic fields. Features in the transverse spin coherence time and g-factor as a function of applied magnetic field reveal a correspondence with Shubnikov de Haas oscillations and illuminate the dominant spin relaxation mechanisms in this regime.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARY26008S