Excitation of pulses of excitonic condensed phase at steady pumping

Pulses of the Excitonic Condensed Phase in Semiconductors with Double Quantum Well at Steady Pumping

“…The explanation of the fragmentation of the inner ring in a laser sport observed in [25] was given in [26]. The developed theory allows one to predict the appearance of solitons [27], which present the localized regions of the exciton condensed phase, the movement of solitons in external fields [28,29], the generation of autowaves in the exciton condensed phases (solitons) at a steady state irradiation of double quantum wells, and the movement of the autowaves on macroscopic distances [30]. According to [27], several conditions should be realized for the appearance of the generation.…”

In-situheight engineering of InGaAs / GaAs quantum dots by chemical beam epitaxy

“…As the driving force increases while keeping the fixed pumping rate in the propagation area, the velocity of the pulses' drift and the frequencies of the generation increase. 8 The authors claim that the considered system is potentially applicable in laser controlled opto-electronic devices. It may be useful for the energy and information transfer in microsystems.…”

“…The study by V. Mykhaylovsky, V. Sugakov, I. Goliney 8 suggests an idea of a generator of traveling pulses of the excitonic condensed phase in laser illuminated double quantum well heterostructures. The pulses would manifest themselves as the bright spots in the emission moving along the plane of the double quantum well despite the time-independent steady pumping.…”

“…The paper 8 suggests an experimental setup in which a generator of traveling pulses can be realized. Analysis of the kinetic equation describing the evolution of the density of indirect excitons with the Landau-type expression for the free energy and account for the external bias shows that there is a region of parameters (exciton density, exciton lifetime) within which the system may support both the uniform distribution of exciton density and the non-uniform distribution where some of the excitons gather into islands of the condensed phase while others are in the gas phase.…”

“…The regular in time generation of pulses occurs at the steady in time illumination. 8 Numerical simulation of the system shows that the pulse generation starts if the pumping rate and the driving force exceed certain threshold values. As the driving force increases while keeping the fixed pumping rate in the propagation area, the velocity of the pulses' drift and the frequencies of the generation increase.…”