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Krivolapchuk, V. V.; Moskalenko, E. S.; Zhmodikov, A. L.

doi:10.1103/physrevb.64.045313

Cited by 39 publications

(36 citation statements)

References 28 publications

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“…In the past ten years, a number of experimental studies have focused on observing these behaviors. 16,17,18,19,20,21,22,23 The coupled quantum well system is conceptually simple:…”

Section: Introductionmentioning

confidence: 99%

Collective properties of indirect excitons in coupled quantum wells in a random field

et al. 2004

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The influence of a random field induced by impurities, boundary irregularities etc. on the superfluidity of a quasi-two-dimensional (2D) system of spatially indirect excitons in coupled quantum wells is studied. The interaction between excitons is taken into account in the ladder approximation. The random field is allowed to be large compared to the dipole-dipole repulsion between excitons. The coherent potential approximation (CPA) allows us to derive the exciton Green's function for a wide range of the random field, and the CPA results are used in the weak-scattering limit, which results in the second-order Born approximation. The Green's function of the collective excitations for the cases of (1) equal electron and hole masses and (2) the "heavy hole" limit are derived analytically. For quasi-two-dimensional excitonic systems, the density of the superfluid component and the Kosterlitz-Thouless temperature of the superfluid phase transition are obtained, and are found to decrease as the random field increases. This puts constraints on the experimental efforts to observe excitonic superfluidity.

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“…In the past ten years, a number of experimental studies have focused on observing these behaviors. 16,17,18,19,20,21,22,23 The coupled quantum well system is conceptually simple:…”

Section: Introductionmentioning

confidence: 99%

Collective properties of indirect excitons in coupled quantum wells in a random field

et al. 2004

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“…Both figures reflect the asymptotic behavior for small q obtained in Eqs. (17), (18) and (19). In the experiment with a dilute exciton gas we should always see a broad maximum at small q which decays according Eq.…”

Section: Discussionmentioning

confidence: 92%

Sensitive linear response of an electron-hole superfluid in a periodic potential

Berman

Kezerashvili

Lozovik

et al. 2017

Physica E: Low-dimensional Systems and Nanostructures

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We consider excitons in a two-dimensional periodic potential and study the linear response of the excitonic superfluid to an electromagnetic wave at low and high densities. It turns out that the static structure factor for small wavevectors is very sensitive to a change of density and temperature. It is a consequence of the fact that thermal fluctuations play a crucial role at small wavevectors, since exchanging the order of the two limits, zero temperature and vanishing wavevector, leads to different results for the structure factor. This effect could be used for high accuracy measurements in the superfluid exciton phase, which might be realized by a gated electron-hole gas. The transition of the exciton system from the superfluid state to a non-superfluid state and its manifestation by light scattering are discussed.

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“…Disorder leads to broadening of luminescence line. For the line, which the authors [9,10,15] connect with the condensed phase, the width is Q = 0.1-1 meV. According to the calculation [17], for Q = 0 5…”

Section: -X Xmentioning

confidence: 99%

“…Recently intense investigations of excitons under intensive irradiation were carried out for indirect excitons in quantum wells (QWs) [9][10][11][12][13][14][15][16]. Indirect excitons in double QW structures with electrons and holes driven to the separate wells by an electric field are long living particles.…”

Section: Introductionmentioning

confidence: 99%

Exciton condensation in quantum wells

Sugakov

2006

Low Temperature Physics

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The theory of exciton condensation is given in two-dimensional systems under suggestion that condensation occurs in really space and condensed phase arises as a result of an attractive interaction between excitons. Due to the finite value of exciton lifetime the sizes of exciton condensed phase regions are restricted and the condensed phase appears in a form of system of islands amid exciton gas. The joint solution of kinetic equations for island size and exciton diffusion equation in the space between islands has been obtained. The theory is applied to explanation of experimental manifestation of condensed phase in quantum wells and also to explanation of the periodical fragmentation, which was observed in luminescence spectrum from a ring around a laser spot in a crystal with double quantum wells. For such explanations the theory does not require the exciton Bose-Einstein condensation.

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Specific features of the indirect exciton luminescence line inGaAs/AlxGa1−x

Cited by 39 publications

References 28 publications

Collective properties of indirect excitons in coupled quantum wells in a random field

Collective properties of indirect excitons in coupled quantum wells in a random field

Sensitive linear response of an electron-hole superfluid in a periodic potential

Exciton condensation in quantum wells

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