Superradiant Decay of Cyclotron Resonance of Two-Dimensional Electron Gases

Abstract

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's theorem.

arXiv comment5 pages, 4 figures

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• Nonequilibrium dynamics of closed interacting quantum systems
• Testing the limits of quantum mechanical superpositions
• Microwave-induced magnetotransport phenomena in two-dimensional electron systems: Importance of electrodynamic effects
• Optical Hall Effect in the Integer Quantum Hall Regime
• Terahertz Time-Domain Magnetospectroscopy of a High-Mobility Two-Dimensional Electron Gas
• Terahertz Coherent Control of a Landau-Quantized Two-Dimensional Electron Gas
• Cyclotron resonance in a two-dimensional electron gas with long-range randomness

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