Motional Enhancement of Exciton Magnetic Moments

Литвинов, А. Н.; Кочерешко, В. П.; Cox, R.T.; Besombes, L.; Mariette, H.; Boukari, H.; Loginov, D. K.; Davies, J.J.; Smith, L. C.; Wolverson, Daniel

doi:10.12693/aphyspola.112.161

Cited by 8 publications

(10 citation statements)

References 7 publications

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“…The exciton concentration in the experiments reported in Refs. 1–4 is less than 10 8 cm −2 , making the mean distance between excitons to be larger than the exciton Bohr radius by at least two orders of magnitude. In such conditions the excitons can be considered as bosons (more precisely as composite bosons 12) and exciton exact possible symmetries are described by the single‐valued IRs of the exciton symmetry group under the field.…”

Section: Symmetry Analysismentioning

confidence: 96%

“…1–4 the exciton momentum is parallel to the magnetic field direction that is chosen in any case as the z ‐direction by the authors of Refs. 1–4. It is also the choice made hereafter.…”

Section: Symmetry Analysismentioning

confidence: 99%

“…The results are the following for the radiative recombination of the various Γ excitons of the R 27 rod group: the totally symmetric Γ 1 exciton state is dark and the Γ 2 exciton recombines with the z‐polarization, hence cannot be created in the experiments described in Refs. 1–4 since the incident light propagates along the z ‐direction. The Γ 3 and Γ 4 excitons radiatively recombine with the σ + and σ − polarizations, respectively.…”

Section: Optical Properties Of Excitons and Zeeman Splittingmentioning

confidence: 99%

“…The bright Γ 4 exciton from the T

_{d}^{2}

group as well as the dark Γ 5 exciton can generate a pair of Γ 3 and Γ 4 excitons of the S

_{4}^{1}

group (see Relation (1)). Symmetry analysis alone cannot decide from which one of the Γ 4 and Γ 5 excitons from the T

_{d}^{2}

group arises the ( Γ 3 , Γ 4 ) pair seen in photoluminescence experiments 1–4. It can just be predicted that the pair involved in the experiments is that with the lower energy.…”

Section: Optical Properties Of Excitons and Zeeman Splittingmentioning

confidence: 99%

“…In recent papers, Davies et al 1–4 have put into evidence a motional enhancement of exciton magnetic moments in zinc‐blende semiconductors using wide quantum wells (QWs) with a magnetic field applied parallel to the [001] growth direction that was also the direction of the exciton motion. On the contrary, the QWs grown along the [110] direction that was also the applied magnetic field and exciton motion direction in the experiments do not exhibit noticeable enhancement.…”

Section: Introductionmentioning

confidence: 99%

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Symmetry‐related motional enhancement of exciton magnetic moment

Tronc¹

2010

Physica Status Solidi (b)

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A dramatic motional enhancement of heavy-and light-hole exciton magnetic moment in zinc-blende semiconductors under a magnetic field applied parallel to the [001] direction has been put into evidence when the exciton moves along the same direction [J. J. Davies et al., Phys. Rev. Lett. 97, 187403 (2006)]. The authors of the paper assigned the effect to a mixing between the 1S and 2P exciton states arising from the cubic term in the Luttinger Hamiltonian expansion in momentum. Such exciton states do not take into account the exact crystal structure since they are just eigenstates of the angular momentum. In addition, the Luttinger Hamiltonian does not take into account the full magnetic-field effect since it does not include the gauge transformations under the symmetry operations of the structure under the field. By determining the exact symmetry of the exciton states, it is shown here that, under a field parallel to the [001] direction, the Zeeman Splitting value vanishes at the G point and, due to accidental quasi-degeneracy in energy between dark and bright exciton states, becomes finite when the exciton moves parallel to the field. A perturbation model allows fitting experimental data and explains the exciton magnetic-moment enhancement with kinetic energy. On the contrary, under a field parallel to the [110] direction with the exciton moving parallel to the field, no accidental degeneracy probably takes place between exciton states. As a consequence, the concept of Zeeman Splitting is not relevant since no energy level is degenerate. In addition, a possible quasi-degeneracy between the excitons recombining with the s þ and s -4] have put into evidence a motional enhancement of exciton magnetic moments in zinc-blende semiconductors using wide quantum wells (QWs) with a magnetic field applied parallel to the [001] growth direction that was also the direction of the exciton motion. On the contrary, the QWs grown along the [110] direction that was also the applied magnetic field and exciton motion direction in the experiments do not exhibit noticeable enhancement. The effect along the [001] direction is present both for heavy-and light-hole excitons. It is clearly a bulk effect since the width of the QWs was in any case larger than the exciton Bohr radius by more than one order of magnitude. Just QWs allow knowing exact values of exciton momentum and separating in energy heavy-and light-hole exciton states. To find an approximated explanation of the results, Davies et al. proposed for the heavy-hole exciton a mixing between the 1S ground state and 2P excited states arising from the cubic term in the Luttinger Hamiltonian [5] expansion in momentum. They stated that their calculation is

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Section: Symmetry Analysismentioning

confidence: 96%

Section: Symmetry Analysismentioning

confidence: 99%

Section: Optical Properties Of Excitons and Zeeman Splittingmentioning

confidence: 99%

“…The bright Γ 4 exciton from the T

_{d}^{2}

group as well as the dark Γ 5 exciton can generate a pair of Γ 3 and Γ 4 excitons of the S

_{4}^{1}

group (see Relation (1)). Symmetry analysis alone cannot decide from which one of the Γ 4 and Γ 5 excitons from the T

_{d}^{2}

group arises the ( Γ 3 , Γ 4 ) pair seen in photoluminescence experiments 1–4. It can just be predicted that the pair involved in the experiments is that with the lower energy.…”

Section: Optical Properties Of Excitons and Zeeman Splittingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Symmetry‐related motional enhancement of exciton magnetic moment

Tronc¹

2010

Physica Status Solidi (b)

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Giant excitonic magneto-Stark effect in wide GaAs/AlGaAs quantum wells

Loginov,

Ignatiev

2025

Physica E: Low-dimensional Systems and Nanostructures

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Photon-magnetoexciton coupling in quantum wells induced by in-plane electric field

Flores-Desirena

Pérez-Rodrı́guez

2011

Journal of Applied Physics

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Articles you may be interested inStrong in-plane optical anisotropy of asymmetric (001) quantum wellsWe theoretically investigate the coupling of light with magnetoexcitons in near-surface quantum wells under the action of a static electric field parallel to the well plane. Such a coupling is here described within the Stahl's real-space density-matrix approach. In particular, we have solved the system of equations for the coherent-wave amplitude and the electromagnetic fields for InGaAs/ GaAs quantum-well heterostructures and calculated their reflectivity spectra. We have found that a parallel electric field of magnitude ϳ1-10 kV/ cm can considerably alter the line shape of optical spectra due to the resonant coupling of light with magnetoexcitons having nonzero angular momentum projection. Besides, we have studied the changes in the profile of the optical spectra as the thickness of the heterostructure cap layer is decreased until it is comparable with the exciton radius and, consequently, the interaction of the magnetoexciton with the sample surface becomes strong.

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Motional Enhancement of Exciton Magnetic Moments

Cited by 8 publications

References 7 publications

Symmetry‐related motional enhancement of exciton magnetic moment

Symmetry‐related motional enhancement of exciton magnetic moment

Giant excitonic magneto-Stark effect in wide GaAs/AlGaAs quantum wells

Photon-magnetoexciton coupling in quantum wells induced by in-plane electric field

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