Exciton condensation in quantum wells: Temperature effects

Sugakov, V. I.

doi:10.1134/s1063783406100283

Cited by 10 publications

(27 citation statements)

References 14 publications

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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%

“…Manyfold theoretical models were proposed to explain the appearance of the structures of the exciton density distribution [6][7][8][9][15][16][17][18][19]21,[25][26][27][28][29][30] . The main efforts were applied for the ascertainment of the principal possibility of the appearance of the periodicity of the exciton density distribution without a detailed application for the experiment.…”

Section: Introductionmentioning

confidence: 99%

“…The main efforts were applied for the ascertainment of the principal possibility of the appearance of the periodicity of the exciton density distribution without a detailed application for the experiment. Specific explanation of the experiment was given in the works 7,25 with respect to only one experiment 2 and in the series of our works 6,8,9,16,17,19,29 applied to different experiments. The authors of the work 7 considered the instability, which arises under kinetics of level occupations by the particles with the Bose-Einstein statistics.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Model Of the System Basic Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2014

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“…MYKHAYLOVSKYY, V.I. SUGAKOV, 2018 In works [13,14], the model were suggested, according to which the appearance of the condensed phase of indirect excitons is connected with the attractive interaction between excitons. The dipole-dipole repulsion causes a shortwave shift of the excitonic luminescence frequency with increasing the exciton densirty.…”

Section: Introductionmentioning

confidence: 99%

“…But the considered system is nonequilibrium due to the presence of a pumping and the finite value of the exciton lifetime. In works [13,14,19], a generalization of the phase transition theory was presented for non-equilibrium systems, and the explanation of the results of experiments in [1,2] was given. In addition, the analysis of another experiments was fulfilled.…”

Section: Introductionmentioning

confidence: 99%

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

Mykhaylovskyy

Sugakov

2018

Ukr. J. Phys.

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The conditions, under which the generation and movement of solitons (regions of exciton condensed phases) occurs in double quantum wells of semiconductors under a stationary pumping and in the presence of an external driving force, are analyzed. It is shown that there is a minimal size of the system, in which a state with moving solitons can be created. The dependence of the minimum value of the driving force necessary for the generation of moving solitons on the size of the system is found.

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Exciton phase transitions in semiconductor quantum wells with disc-shaped electrode

Chernyuk¹,

Sugakov²,

Tomylko³

2012

J. Phys.: Condens. Matter

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Phase transitions in a system of indirect excitons in semiconductor double quantum wells are studied for a set-up when one of the electrodes is of finite size and, in particular, has the shape of a disc. At voltage a region under the rim of the disc is created where excitons have lower energy, thus providing a macroscopic trap attractive for excitons while being repulsive for charged particles. The theory of the formation of patterns of the excitonic condensed phase under the disc is built based on the assumption of the existence of the inter-exciton range where the interaction between them is attractive. The finite value of the exciton lifetime is taken into account serving as a limiting factor for the size of the islands of the condensed phase. The calculations reveal complex restructuring of the patterns of the spatial distribution of exciton density with increasing pumping intensity: from the structureless gaseous phase to separate islands of the condensed phase within the gaseous phase, then to islands of the gaseous phase in the bulk of the condensed phase and finally to the continuous condensed phase.

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Exciton condensation in quantum wells: Temperature effects

Cited by 10 publications

References 14 publications

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

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

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

Exciton phase transitions in semiconductor quantum wells with disc-shaped electrode

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