Oscillatory behavior of a superradiating system coupled to electron   reservoirs
  We investigate a superradiating system coupled to external reservoirs. Under conditions where electrons tunneling at a rate $T$ act like an electron pump, we predict a novel phenomenon in the form of oscillations with a frequency $\omega \simeq \sqrt{2\Gamma T}$ that appear in the (photon) emission intensity, where $\Gamma $ is the spontaneous decay rate of a single two-level system. The effect, together with a strong enhancement of the superradiant peak, should be observable in semiconductor quantum wells in strong magnetic fields, or in quantum dot arrays. 
T. Brandes (1), J. Inoue (2), A. Shimizu (2) ((1) Univ. Hamburg   (Germany); (2) Univ. Tokyo (Japan))