Eliade Stefanescu - DYNAMICS OF A SUPER RADIANT DISSIPATIVE SYSTEM OF ELECTRONS TUNNELING IN A MICRO-CAVITY

Version 1

      Publication Details (including relevant citation   information):

      Rom. Journ. Phys. 50 (2005) 629-638.

      Abstract:

      We discuss the super-radiant dissipative tunneling of electrons   in a perfectly
      tuned micro-cavity of a p-i-n semiconductor structure with   quantum dots. Our
      description is based on a quantum master equation with   microscopic coefficients,
      depending on two-body potentials, densities of the dissipative   environment states,
      and temperature, that is in accordance with the detailed balance   principle. For this
      system, we obtain Maxwell-Bloch equations with explicit   microscopic dissipative
      coefficients, while taking into account a current that could be   injected in the device,
      and the field dissipation and propagation, that essentially   determine the superradiation
      process. We are especially interested in the absolute values of   the superradiant
      pulse amplitude and in the space and time-distributions as   functions of
      physical characteristics and operation conditions of the system.   Due to the planar
      distribution of the quantum dots, at a low density of these dots   the super-radiant
      exponent is 3, not 2 as it is for a volume distribution. Due to   Rabi oscillations, in an
      under-damped system the super-radiant exponent decreases with the   quantum dot
      density, tending to 1.5. Power densities of the order of those   that could be absorbed
      from Sun at the level of our planet are easily obtained for   realistic values of the
      system parameters and operation conditions.

      Address (URL): http://www.nipne.ro/rjp/2005_50_7-8/0629_0638.pdf