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Köhl, M.; Heitmann, D.; Grambow, P.; Ploog, K.

doi:10.1103/physrevlett.63.2124

Cited by 163 publications

(27 citation statements)

References 17 publications

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“…Excitons in magnetic fields have been investigated in structures such as quantum wells, 15,16 quantum wires, 17 and quantum dots, [18][19][20][21][22] as example of multicarrier systems. For the ring geometry, one question that arises naturally is whether there is sensitivity of the exciton properties to an applied flux.…”

Section: 6mentioning

confidence: 99%

Magnetic field effects on quantum ring excitons

2001

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We study the effect of magnetic field and geometric confinement on excitons confined to a quantum ring. We use analytical matrix elements of the Coulomb interaction and diagonalize numerically the effective-mass Hamiltonian of the problem. To explore the role of different boundary conditions, we investigate the quantum ring structure with a parabolic confinement potential, which allows the wavefunctions to be expressed in terms of center of mass and relative degrees of freedom of the exciton. On the other hand, wavefunctions expressed in terms of Bessel functions for electron and hole are used for a hard-wall confinement potential. The binding energy and electron-hole separation of the exciton are calculated as function of the width of the ring and the strength of a external magnetic field. The linear optical susceptibility as a function of magnetic fields is also discussed. We explore the Coulomb electron-hole correlation and magnetic confinement for several ring width and size combinations. The Aharanov-Bohm oscillations of exciton characteristics predicted for one-dimensional rings are found to not be present in these 1 finite-width systems.

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Section: 6mentioning

confidence: 99%

Magnetic field effects on quantum ring excitons

2001

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“…This reduction results in a concentration of the density of states at the band edge and in reduced scattering in the remaining directions of free motion, which is both of interest for optical and electrical devices such as laser diodes and fast transistors. [1][2][3][4] It can be achieved by structural sizes in the nanometer range, resulting in an energy difference of the confined states larger than both the thermal energy and the excitonic binding energy.…”

Section: Introductionmentioning

confidence: 99%

Influence of the interface corrugation on the subband dispersions and the optical properties of (113)-oriented GaAs/AlAs superlattices

et al. 1996

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We report on the influence of the interface corrugation in ͑113͒-grown GaAs/AlAs superlattices on their band-edge optical properties both in theory and experiment. We calculate the subband dispersions and the optical anisotropies in a multiband k•p formalism. The dominating contribution to the optical anisotropies is found to be due to the intrinsic properties of the valence-band structure. The corrugation modifies the density of states only slightly, giving no evidence of a quantum-wire behavior. By comparing the calculation with the experimental optical anisotropy, we can estimate the corrugation height to be at most 2 monolayers. The experiments show that deviations from the regular corrugation lead to an anisotropic interface disorder. This gives rise to an enhanced anisotropy of the band-edge states, which was so far attributed to the corrugation itself. The luminescence of the localized type-I states at the band-edge show an enhanced optical anisotropy in comparison to the luminescence of the extended states, revealing the anisotropic nature of their localization sites. In type-II samples, deeply localized, isolated type-I states (⌫ quantum boxes͒ dominate the luminescence at short delays after pulsed excitation and at higher lattice temperatures or excitation densities, due to their strong radiative decay compared to the type-II states. These quantum boxes are observed individually by high spatial and spectral resolution. ͓S0163-1829͑96͒06039-0͔

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“…Quantum wires fabricated by etching a lateral pattern through quantum well stuctures [16,17] and wires directly grown on vicinal substrats [18,19] or on the cleave-edge of heterostuctures [20,21] have been investigated this way. A quantitative comparison of the theoretical results with the experiments is difficult for a couple of reasons.…”

Section: Discussionmentioning

confidence: 99%

Theoretical Study of Polarization Effects in Laterally Modulated Quantum Wells

Bockelmann

1993

Acta Phys. Pol. A

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Polarization anisotropies of luminescence spectra caused by a potential modulation in the quantum well plane are discussed. Any lateral potential induces heavy hole light hole mixing. This leads to lateral polarization dependence of the interband transition rates if the confinement potential is not symmetrical with respect to rotations by 90 degrees around the quantum well growth axis. We present some numerical results for quantum wire arrays and discuss to what extent the present theory can be compared to experimental results.

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One-dimensional magneto-excitons in GaAs/AlxGa1−

Cited by 163 publications

References 17 publications

Magnetic field effects on quantum ring excitons

Magnetic field effects on quantum ring excitons

Influence of the interface corrugation on the subband dispersions and the optical properties of (113)-oriented GaAs/AlAs superlattices

Theoretical Study of Polarization Effects in Laterally Modulated Quantum Wells

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