Superradiant decay of cyclotron resonance of two-dimensional electron gases. Academic Article uri icon

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.

author list (cited authors)

  • Zhang, Q. i., Arikawa, T., Kato, E., Reno, J. L., Pan, W., Watson, J. D., ... Kono, J

complete list of authors

  • Zhang, Qi||Arikawa, Takashi||Kato, Eiji||Reno, John L||Pan, Wei||Watson, John D||Manfra, Michael J||Zudov, Michael A||Tokman, Mikhail||Erukhimova, Maria||Belyanin, Alexey||Kono, Junichiro

publication date

  • January 1, 2014 11:11 AM