Influence of well-width fluctuations on the binding energy of excitons, charged excitons, and biexcitons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">GaAs</mml:mi></mml:mrow></mml:math>-based quantum wells

Filinov, A.; Riva, C.; Peeters, F. M.; Lozovik, Yu. E.; Bönitz, M.

doi:10.1103/physrevb.70.035323

Cited by 82 publications

(63 citation statements)

References 35 publications

(141 reference statements)

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“…This allows us to completely neglect the effect of 1 monolayer well width fluctuations on the exciton binding energy and localization. Some quantitative analysis can be found in A. Filinov et al 39 In our case, the in-plane size of the exciton wavefunction is comparable to the dipole moment d = 13.3a * B ≈ 400 Åand is, therefore, of the order of the characteristic lateral size of the interface fluctuations ∼ 400 Å (see D. Gammon et al…”

Section: Discussionmentioning

confidence: 86%

Crystallization of an exciton superfluid

2011

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Indirect excitons -pairs of electrons and holes spatially separated in semiconductor bilayers or quantum wells -are known to undergo Bose-Einstein condensation and to form a quantum fluid. Here we show that this superfluid may crystallize upon compression. However, further compression results in quantum melting back to a superfluid. This unusual behavior is explained by the effective interaction potential between indirect excitons which strongly deviates from a dipole potential at small distances due to many-particle and quantum effects. Based on first principle path integral Monte Carlo simulations, we compute the complete phase diagram of this system and predict the relevant parameters necessary to experimentally observe exciton crystallization in semiconductor quantum wells.

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Section: Discussionmentioning

confidence: 86%

Crystallization of an exciton superfluid

2011

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“…Trions or "charged excitons" compete with excitons in the luminescence of carbon nanotubes (CNTs) [1][2][3][4][5][6][7][8][9][10][11] and transition-metal dichalcogenides [12][13][14][15]. They result from correlation between (light-activated) excitons and additional charges (from doping or gating).…”

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confidence: 99%

“…(2)) and excitons (from the BSE) in a consistent way. In semiconductor quantum systems, similar Hamiltonians are commonly employed [6][7][8][9][10][11] (see next paragraph). A detailed discussion can be found in the Supplementary Material [18].…”

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Three-particle correlation from a Many-Body Perspective: Trions in a Carbon Nanotube

2016

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Trion states of three correlated particles (e.g., two electrons and one hole) are essential to understand the optical spectra of doped or gated nanostructures, like carbon nanotubes or transitionmetal dichalcogenides. We develop a theoretical many-body description for such correlated states using an ab-initio approach. It can be regarded as an extension of the widely used GW method and Bethe-Salpeter equation, thus allowing for a direct comparison with excitons. We apply this method to a semiconducting (8,0) carbon nanotube, and find that the lowest optically active trions are red-shifted by ∼ 130 meV compared to the excitons, confirming experimental findings for similar tubes. Moreover, our method provides detailed insights in the physical nature of trion states. In the prototypical carbon nanotube we find a variety of different excitations, discuss the spectra, energy compositions, and correlated wave functions.

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“…The binding energy of the singlet trion must be further decreased by a Zeeman splitting E Z of the second carrier that flips its spin when binding to the exciton. Local perturbations such as well width fluctuations [3] or nearby ionized impurities [4] can also affect trion stability and recombination.…”

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confidence: 99%

Comparative Numerical Analysis of Quasi-Two-Dimensional Negative and Positive Trions in High Magnetic Fields

Trojnar

Wójs

2008

Acta Phys. Pol. A

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Exact diagonalization calculations in the Haldane spherical geometry are carried out for the three-body Coulomb problem in a quasi-two--dimensional quantum well, in the presence of perpendicular magnetic field. Simultaneous inclusion of several Landau levels and quantum well subbands in the configuration-interaction basis allowed for quantitative description of the coupling between the in-plane dynamics (governed by interplay of cyclotron quantization and Coulomb interactions) and single-particle excitations in the normal direction. The energy spectra of negative and positive trions are compared in symmetric and asymmetric wells with realistic widths and carrier concentrations. Effects of nearby impurities are also studied.

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Influence of well-width fluctuations on the binding energy of excitons, charged excitons, and biexcitons inGaAs-based quantum wells

Cited by 82 publications

References 35 publications

Crystallization of an exciton superfluid

Crystallization of an exciton superfluid

Three-particle correlation from a Many-Body Perspective: Trions in a Carbon Nanotube

Comparative Numerical Analysis of Quasi-Two-Dimensional Negative and Positive Trions in High Magnetic Fields

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