Combined Exciton-Cyclotron Resonance in Photoluminescence of a Two-Dimensional Hole Gas

Theory of combined exciton-cyclotron resonance in a two-dimensional electron gas: The strong magnetic-field regime

I developed a theory of combined exciton-cyclotron resonance ~ExCR! in a low-density two-dimensional electron gas in high magnetic fields. In the presence of excess electrons an incident photon creates an exciton and simultaneously excites one electron to higher-lying Landau levels. I derived exact ExCR selection rules that followed from the existing dynamical symmetries, magnetic translations ...

Combined Exciton-Cyclotron Resonance in Quantum Well Structures

Cyclotron Resonance in a Two-Dimensional Electron Gas with Long-Range Randomness

We show that the cyclotron resonance in a two-dimensional electron gas has nontrivial properties if the correlation length of the disorder is larger than the Fermi wavelength: (a) The line shape assumes three different forms in strong, intermediate, and weak magnetic fields. (b) The linewidth collapses at the transition from the intermediate to the weak fields via the motional narrowing mechani...

Cyclotron Resonance in a Two-dimensional Electron Gas with Long-range Disorder

We show that the the cyclotron resonance in a two-dimensional electron gas has nontrivial properties if the correlation length of the disorder is larger than the de Broglie wavelength: (a) the linewidth depends di erently on the magnetic eld in strong, intermediate, and weak magnetic eld regimes (b) at the transition from the intermediate to the weak elds the linewidth suddenly collapses due to...

Superradiant decay of cyclotron resonance of two-dimensional electron gases.

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 mech...