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Superradiant emission in a high-mobility two-dimensional electron gas. 2023
B Barman, and
A G Linn, and
A L O'Beirne, and
J Holleman, and
C Garcia, and
V Mapara, and
J L Reno, and
S A McGill, and
V Turkowski, and
D Karaiskaj, and
D J Hilton
College of Innovation and Technology, University of Michigan-Flint, Flint, MI 48502, United States of America.
We use terahertz time-domain spectroscopy to study gallium arsenide two-dimensional electron gas samples in external magnetic field. We measure cyclotron decay as a function of temperature from 0.4 to10Kand a quantum confinement dependence of the cyclotron decay time belowT0=1.2K. In the wider quantum well, we observe a dramatic enhancement in the decay time due to the reduction in dephasing and the concomitant enhancement of superradiant decay in these systems. We show that the dephasing time in 2DEG's depends on both the scatteringrateand also on the distribution of scattering angles.
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