Change in dimensionality of superlattice excitons induced by an electric field

Agulló‐Rueda, F.; Ja, Brum; Méndez, E. E.; Hong, Ji Man

doi:10.1103/physrevb.41.1676

Cited by 34 publications

(9 citation statements)

References 10 publications

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“…25 The preceding discussion has shown that at least in the intermediate-to-low-field range a detailed analysis of the absorption spectra requires a series of consecutive spectra to make a definite identification of the structures possible. In order to illustrate this, we investigate experimental results of Agulló-Rueda et al, 32 and restrict ourselves to the hh1-c1 transitions as before. In Fig.…”

Section: Basic Absorption Characteristicsmentioning

confidence: 98%

Excitons in superlattices: Absorption asymmetry, dimensionality transition, and exciton localization

Linder

1997

Phys. Rev. B

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We calculate the field-dependent excitonic absorption spectra of semiconductor superlattices by diagonalizing the full Hamiltonian of the problem. Our model therefore includes both bound and continuum states of the excitons. The theoretical results are compared with experiments. We first show that the Coulomb interaction does not destroy the field-induced transition from the Franz-Keldysh to the Wannier-Stark regime, but causes an absorption asymmetry in the spectra, i.e., a dominance of Wannier-Stark transitions with negative indices. This effect, which has been observed before, is explained by a Coulomb-induced shift of oscillator strength from higher to lower energies in a simple model involving an effective Coulomb potential. We further address the problem of the transformation of the quasi-two-dimensional excitons of the Wannier-Stark levels to the three-dimensional miniband excitons obtained for zero field. For finite electric fields the quasibound miniband exciton states are explained as resonant states of the various Wannier-Stark excitons. We show that in contradiction to previous assumptions the Wannier-Stark ladder transitions are never suppressed by exciton localization. The observability of the transitions only depends on the relation between the zero-field miniband width and the linewidth of the transitions, but not on the ratio between miniband width and exciton binding energy.

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Section: Basic Absorption Characteristicsmentioning

confidence: 98%

Excitons in superlattices: Absorption asymmetry, dimensionality transition, and exciton localization

Linder

1997

Phys. Rev. B

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“…There is an ongoing debate as to what extent excitonic WS transitions can change the properties of the single-particle picture. In an earlier theoretical work [7] it was demonstrated that at low electric fields, anticrossings between excitonic WS levels occur, which had also been observed in some experiments [8,9]. However, very recently, it was argued [10] that this behaviour is, in fact, due to anticrossings between n = −1 WS states and zero field miniband exciton states.…”

Section: Introductionmentioning

confidence: 75%

Interaction of Wannier–Stark levels in a wide well superlattice

Till

Kümmel

Philipp

et al. 1998

Superlattices and Microstructures

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“…We attribute this difference to changes of the LE energy with electric field due to the transition from the quasi-three-dimensional SL to the two-dimensional QW regime. 17 A series of Stokes and anti-Stokes spectra for different electric fields is shown in Fig. 2͑c͒.…”

Section: B Low-field Resonancesmentioning

confidence: 99%

Acoustic-phonon Raman scattering from Wannier-Stark levels in GaAs/AlAs superlattices

et al. 1997

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We study the electronic structure of a GaAs/AlAs superlattice in an electric field by acoustic-phonon Raman scattering. Resonantly enhanced disorder-induced processes ͑continuous emission͒ occur whenever the exciting laser energy coincides with interband transitions between heavy hole and electron Stark levels with ⌬nϭ0,Ϯ1. We also observe oscillations of the scattering intensity due to the delocalization of localized excitons induced by resonant interaction either with emerging Stark states of neighboring quantum wells in the same miniband or with Stark states from the next higher electron miniband. ͓S0163-1829͑97͒07328-1͔

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Change in dimensionality of superlattice excitons induced by an electric field

Cited by 34 publications

References 10 publications

Excitons in superlattices: Absorption asymmetry, dimensionality transition, and exciton localization

Excitons in superlattices: Absorption asymmetry, dimensionality transition, and exciton localization

Interaction of Wannier–Stark levels in a wide well superlattice

Acoustic-phonon Raman scattering from Wannier-Stark levels in GaAs/AlAs superlattices

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