Formation of inhomogeneous structures of condensed phases of excitons in quantum wells

Sugakov, V. I.

doi:10.1103/physrevb.76.115303

Cited by 22 publications

(40 citation statements)

References 39 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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“…Sometimes the islands were localized periodically in the space. The references to the applications of the theory of phase transitions in systems of unstable particles to the explanation of experiments with excitons are given in 31,32,35 . The formation of the new phase in a system of unstable particles has distinct features compared to the phase transition in the system of stable particles.…”

Section: Introductionmentioning

confidence: 99%

Formation of new phase inclusions in the system of quasiequilibrium magnons of high density

Sugakov

2016

Phys. Rev. B

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The paper studies the spatial variation of the magnetization in a nonconducting magnetic sample with an excess number of magnons in comparison to the equilibrium. The phenomenon is considered using the Landau-Lifshits equation with additional terms describing the longitudinal relaxation of the magnetization, the magnon diffusion and the magnon creation by external pumping. The free energy of the system is presented in the mean field approximation. It is shown that, if the pumping exceeds some critical value, regions of the new phase arise where the magnetic moments are oriented opposite to the magnetization of the magnetic sample. The phenomenon is similar to the appearance of droplets of the condensed phase in the supersaturated vapor. The appearance of the new phase either in the form of a single domain or a periodical lattice is demonstrated. The studied process is a competitor to the process of the Bose-Einstein condensation of magnons.

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Formation of inhomogeneous structures of condensed phases of excitons in quantum wells

Cited by 22 publications

References 39 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

Formation of new phase inclusions in the system of quasiequilibrium magnons of high density

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