Superradiant Decay of Cyclotron Resonance of Two-Dimensional Electron Gases
Date of this Version
7-21-2014Abstract
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.
Discipline(s)
Nanoscience and Nanotechnology
Comments
This is the publisher PDF of Zhang, Q; Arikawa, T; Kato, E; Reno, JL; Pan, W; Watson, JD; Manfra, MJ; Zudov, MA; Tokman, M; Erukhimova, M; Belyanin, A; Kono, J. "Superradiant Decay of Cyclotron Resonance of Two-Dimensional Electron Gases." Physical Review Letters, 113:4. 047601. 2014. Copyright APS, available at http://dx.doi.org/10.1103/PhysRevLett.113.047601.