Attractive and repulsive dipolar interaction in bilayers of indirect excitons

Choksy, D. J.; Xu, Chao; Fogler, M. M.; Butov, L. V.; Norman, Justin; Gossard, A. C.

doi:10.1103/physrevb.103.045126

Cited by 17 publications

(30 citation statements)

References 55 publications

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“…The latter behavior was observed experimentally in Ref. [45]. Crucially, this transition can be probed via a continuous tuning of layers densities, allowing for direct experimental observation of quantum critical dynamics.…”

Section: Numerical Methods and Observablesmentioning

confidence: 55%

“…Ref. [45] has reported a monotonic red (blue) shift of the probed layer as a function of laser pumping power applied to the complementary (same) layer. The appearance of red shifted IX energies in both experiments provides experimental evidence for the effective coupling and the energy gain associated with inter-layer dipolar attraction, which inspires exploring experimental signatures of the resulting quantum manybody phenomena.…”

Section: Introductionmentioning

confidence: 98%

“…The simplest DQW multilayered layout is a bilayer geometry at a fixed and well defined lateral separation L z , which was recently realized in GaAs heterostructures [10, 44,45], see Fig. 1a.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons

Zimmerman,

Rapaport,

Gazit

2022

Preprint

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Layered bosonic dipolar fluids have been suggested to host a condensate of inter-layer molecular bound states. However, its experimental observation has remained elusive. Motivated by two recent experimental works [Hubert et al., Phys. Rev. X 9, 021026 (2019) and D. J. Choksy et al., Phys. Rev. B 103 045126 (2021)], we theoretically study, using numerically exact quantum Monte Carlo calculations, the experimental signatures of collective inter-layer pairing in indirect exciton (IX) bilayers. We find that IX energy shifts associated with each layer evolve non-trivially as a function of density imbalance following a non-monotonic trend with a jump discontinuity at density balance, identified with the inter-layer IX molecule gap. This behavior discriminates between the superfluidity of inter-layer bound pairs and independent dipole condensation in distinct layers. Considering finite temperature and finite density imbalance conditions, we find a cascade of Berezinskii-Kosterlitz-Thouless (BKT) transitions, initially into a pair superfluid and only then, at lower temperatures, into complete superfluidity of both layers. Our results may provide a theoretical interpretation of existing experimental observations in GaAs double quantum well (DQW) bilayer structures. Furthermore, to optimize the visibility of pairing dynamics in future studies, we present a detailed analysis of realistic experimental settings in GaAs and transition-metal dichalcogenide (TMD) bilayer DQW heterostructures.

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Section: Numerical Methods and Observablesmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons

Zimmerman,

Rapaport,

Gazit

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…If the electric field is applied along the z–direction, the electrons and holes will be pulled into different quantum wells due to their opposite charges, and form spatially indirect exciton (IX). An IX is a bound pair of an electron and a hole in separated by a thin tunnel barrier [ 6 ]. Electron and hole will relax into their respective wells by tunnelling through the narrow barrier layer.…”

Section: Introductionmentioning

confidence: 99%

Optical Measurements and Theoretical Modelling of Excitons in Double ZnO/ZnMgO Quantum Wells in an Internal Electric Field

et al. 2021

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In this paper, the photoluminescence spectra of excitons in ZnO/ZnMgO/ZnO double asymmetric quantum wells grown on a–plane Al2O3 substrates with internal electric-field bands structures were studied. In these structures, the electron and the hole in the exciton are spatially separated between neighbouring quantum wells, by a ZnMgO barrier with different thickness. The existence of an internal electric field generates a linear potential and, as a result, lowers the energy of quantum states in the well. For the wide wells, the electrons are spatially separated from the holes and can create indirect exciton. To help the understanding of the photoluminescence spectra, for single particle states the 8 k·p for wurtzite structure is employed. Using these states, the exciton in the self-consistent model with 2D hydrogenic 1s–like wave function is calculated.

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“…These nonlinearities allow the photons to interact, making the concept of optical computations possible. The various exciton-quasiparticle interactions are widely studied in heterostructures with quantum wells (QWs) [7][8][9][10], microcavities [11], two-dimensional structures [12][13][14], and many other systems [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Exciton-exciton and exciton-charge carrier interaction and the exciton collisional broadening in GaAs/AlGaAs quantum wells

Gribakin,

Khramtsov,

Trifonov

et al. 2021

Preprint

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Wave functions of heavy-hole excitons in GaAs/Al0.3Ga0.7As square quantum wells (QWs) of various widths are calculated by the direct numerical solution of a three-dimensional Schrödinger equation using a finite-difference scheme. These wave functions are then used to determine the exciton-exciton, exciton-electron and exciton-hole fermion exchange constants in a wide range of QW widths (5 − 150 nm). Additionally, the spin-dependent matrix elements of elastic excitonexciton, exciton-electron and exciton-hole scattering are calculated. From these matrix elements, the collisional broadening of the exciton resonance is obtained within the Born approximation as a function of the areal density of excitons, electrons and holes respectively for QW widths of 5, 15, 30 and 50 nm. The obtained numerical results are compared with other theoretical works.

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Attractive and repulsive dipolar interaction in bilayers of indirect excitons

Cited by 17 publications

References 55 publications

Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons

Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons

Optical Measurements and Theoretical Modelling of Excitons in Double ZnO/ZnMgO Quantum Wells in an Internal Electric Field

Exciton-exciton and exciton-charge carrier interaction and the exciton collisional broadening in GaAs/AlGaAs quantum wells

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