Superradiant Decay of Cyclotron Resonance of Two-Dimensional Electron Gases
Reno, John L.
Watson, John D.
Manfra, Michael J.
Zudov, Michael A.
We report on the observation of collective radiative decay, or superradiance, of cyclotron resonance (CR) in high-mobility two-dimensional electron gases in GaAs quantum wells using time-domain terahertz magnetospectroscopy. The decay rate of coherent CR oscillations increases linearly with the electron density in a wide range, which is a hallmark of superradiant damping. Our fully quantum mechanical theory provides a universal formula for the decay rate, which reproduces our experimental data without any adjustable parameter. These results firmly establish the many-body nature of CR decoherence in this system, despite the fact that the CR frequency is immune to electron-electron interactions due to Kohnﾒs theorem.
Citable link to this pagehttp://hdl.handle.net/1911/94751
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