Exciton condensation in semiconductor quantum wells with a periodical modulation of potential

Chernyuk, A. A.; Sugakov, V. I.

doi:10.1016/j.ssc.2009.09.015

Cited by 7 publications

(12 citation statements)

References 24 publications

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“…Our model is based on the appearance of self-organization processes in non-equilibrium systems for excitons with attractive interaction shown in [2,3]. Investigations performed in this model [19][20][21][22][23][24][25] gave the explanations of spatial structures and their temperature and pumping dependencies obtained in different experiments [4,5,[8][9][10]. Theoretical approaches of the works [19][20][21][22][23][24][25] are based on the following assumptions.…”

Section: Introductionmentioning

confidence: 99%

Exciton condensation in quantum wells. Exciton hydrodynamics. The effect of localized states

Sugakov¹

2014

Condens. Matter Phys.

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The hydrodynamic equations for indirect excitons in the double quantum wells are studied taking into account 1) a possibility of an exciton condensed phase formation, 2) the presence of pumping, 3) finite value of the exciton lifetime, 4) exciton scattering by defects. The threshold pumping emergence of the periodical exciton density distribution is found. The role of localized and free exciton states is analyzed in the formation of emission spectra.

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Section: Introductionmentioning

confidence: 99%

Exciton condensation in quantum wells. Exciton hydrodynamics. The effect of localized states

Sugakov¹

2014

Condens. Matter Phys.

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“…In the previous studies of the condensed phase, two popular models of the phase transitions were used. We applied the stochastic model of the nucleation-growth (Livshits-Slyosov) in the works 6,8,17 and the model of spinodal decomposition (Kahn-Hillert) in the works 9,16,19,[27][28][29] , modified and generalized for a system of particles with a finite lifetime. For the solution of the problem of the present paper, we applied a modified model of spinodal decomposition.…”

Section: Model Of the System Basic Equationsmentioning

confidence: 99%

“…32 . The model of the phase transitions of particles with a finite lifetime successfully managed to describe 6,9,16,17,19,[27][28][29] the emission from the ring around the laser spot, observed in Ref. 2 , the emission from the quantum well under the aperture in the electrode, observed in Refs.…”

Section: Introductionmentioning

confidence: 99%

Model of fragmentation of the exciton inner ring in semiconductor quantum wells

2014

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The appearance of the non-homogeneous structures of the indirect exciton density distribution in the region of the quantum well (in the region of the inner ring) is explained. The structure (the fragmentation) occurs due to the exciton condensed phase formation because of interaction between excitons. The formation of the structure is related with the non-equalibrity of the system, which is caused by the exciton finite lifetime and the presence of the pumpimg. The structure emerges in the shape of a set of islands or circles of the condensed phase. The structure type depends on the pumping intensity, the size of the laser spot and disappears with increasing the temperature. The merging of two structures, created by different laser spots, is investigated at decreasing the distance between the centers of the spots.

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“…We use the phenomenological model of phase transitions generalized for particles of the finite lifetime for simulation of the exciton density profiles under electrodes of different shapes. This section provides only a brief description of the simulation method, a detailed description of the approach can be found, for example, in [25,30]. The timedependent distribution of the exciton density n satisfies the nonlinear equation: .…”

Section: Exciton Density Patternsmentioning

confidence: 99%

“…The exciton density distribution is described phenomenologically using Landau model of phase transitions generalized for particles with the finite lifetime. This approach is based on two main assumptions used in our previous papers [21][22][23][24][25]30,31] that were successful in the explanation of experimental results.…”

Section: Introductionmentioning

confidence: 99%

Exciton density pattern formation in laser irradiated quantum wells under electrodes of various shapes

Tomylko

Goliney

Chernyuk

et al. 2014

Low Temperature Physics

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The condensation of indirect excitons in double quantum wells is studied in an electric field created by electrodes of different shapes. The finite value of the exciton lifetime, the pumping and nonuniformity of the electric field under the electrode are taken into account. It is shown that islands of exciton condensed phase emerge under electrodes when the pumping exceeds a certain threshold value. They appear first under the rim where the potential energy of excitons has a dip. Calculations predict a complicated evolution of the exciton density distribution: from the gaseous phase at low laser intensities to the condensed phase in the whole area under the electrode at larger intensities. Therefore, the configurations of the exciton condensed phase may be manipulated by choosing the setups with conductive electrodes of different shapes via forming specific potentials of the electrical field and controlled by the level of the laser irradiation.

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Exciton condensation in semiconductor quantum wells with a periodical modulation of potential

Cited by 7 publications

References 24 publications

Exciton condensation in quantum wells. Exciton hydrodynamics. The effect of localized states

Exciton condensation in quantum wells. Exciton hydrodynamics. The effect of localized states

Model of fragmentation of the exciton inner ring in semiconductor quantum wells

Exciton density pattern formation in laser irradiated quantum wells under electrodes of various shapes

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