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

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

doi:10.1103/physrevb.90.205308

Cited by 11 publications

(6 citation statements)

References 52 publications

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“…This model was applied to the explanation of other experiments in which the manifestation of the large exciton density was observed. Thus, the explanations of different patterns in the GaAS/AlGaAs based double quantum wells excited through windows of different shape in metallic electrodes obtained in [16,31] were given in [32][33][34], the peculiarities of the emergence of spatial structures in the luminescence of indirect excitons in a periodic potential obtained in [35] were presented in [36], the explanations of the fracturing of the inner ring around the laser sport [37] were given in the paper [38].…”

Section: Introductionmentioning

confidence: 99%

Exciton condensation in quantum wells with defects of macroscopic sizes

Sugakov¹

2019

J. Phys.: Condens. Matter

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Formation of the excitonic condensed phase in quantum wells with defects of macroscopic size is investigated in the case of a specific kind of defect arising in local areas of planar quantum wells where the wells are thicker or thinner by an atomic monolayer or two. The excitonic system in the wells is non-equilibrium as the excitons are constantly created by an irradiation and decay due to the finite lifetime. The condensation considered in the paper is not the Bose-Einstein condensation but rather the classical condensation due an interaction between excitons with additional peculiarities caused by non-equilibrium conditions. The main contribution to the exciton's energy in the defect's area comes from the energy of the exciton's confinement along the growth axis and the respective quantization of the exciton's levels. The condensation manifests itself by an enhancement the exciton accumulation in the defect's area with increasing pumping and by an appearance of different types of structures in the exciton density distribution when the defect's size is large. The condensed phase may appear in the form of islands or in the form of rings on the defect's boundary. It is shown, that the value of the exciton's lifetime plays an important role in the spatial distribution of the exciton density. The similarity and the difference of density structures for wells with the extra or lacking atomic monolayer in the defect's area are investigated. The specific features of the manifestation of the exciton luminescence at the condensation in the defect's region is analyzed.

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Section: Introductionmentioning

confidence: 99%

Exciton condensation in quantum wells with defects of macroscopic sizes

Sugakov¹

2019

J. Phys.: Condens. Matter

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“…The structures that arise in the luminescence from double quantum wells with electrodes of the different form [22,23] were explained in [24]. 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].…”

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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“…[14]. The strongly nonideal system of the excitons in the CQW considered as structureless bosons was considered in [24][25][26], the exciton correlation being taken into account in a semi-phenomenological way.…”

Section: Introductionmentioning

confidence: 99%

Quantum phase transition of electron-hole liquid in coupled quantum wells

Babichenko

Polishchuk

2016

Phys. Rev. B

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Many-component electron-hole plasma is considered in the Coupled Quantum Wells (CQW). It is found that the homogeneous state of the plasma is unstable if the carrier density is sufficiently small. The instability results in the breakdown into two coexisting phase -a low-density gas phase and a high-density electron-hole liquid. The homogeneous state of the electron-hole liquid is stable if the distance between the quantum wells ℓ is sufficiently small. However, as the distance ℓ increases and reaches a certain critical value ℓ cr , the plasmon spectrum of the electron-hole liquid becomes unstable. Hereupon, a quantum phase transition occurs, resulting in the appearance of the charge density waves of finite amplitude in both quantum wells. The strong mass renormalization and the strong Z-factor renormalization are found for the electron-hole liquid as the quantum phase transition occurs.

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

Cited by 11 publications

References 52 publications

Exciton condensation in quantum wells with defects of macroscopic sizes

Exciton condensation in quantum wells with defects of macroscopic sizes

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

Quantum phase transition of electron-hole liquid in coupled quantum wells

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