Using THz-time-domain magneto-spectroscopy, we have studied the dynamics of a 2DEG (3.4×10 6 cm 2 V −1 s −1 ) as a function of temperature (0.4 K–100 K). The decoherence lifetimes increase monotonically as temperature decreases below 1 K. We will discuss the mechanisms that contribute to the lifetimes.
We use ultrafast terahertz spectroscopy to study the magnetoconductivity tensor of a 2DEG as a function of temperature (0.4 K-100 K). The magnetoconductivity line width decreases monotonically with temperature.