Magneto-optical properties of ring-shaped self-assembled InGaAs quantum dots

Haft, D.; Schulhauser, C.; Govorov, Alexander O.; Warburton, Richard J.; Karrai, K.; Garcı́a, J.M.; Schoenfeld, Winston V.; Petroff, P. M.

doi:10.1016/s1386-9477(01)00511-2

Cited by 48 publications

(34 citation statements)

References 11 publications

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“…As reported in Ref. [25] for a very similar system, the value of Zeeman splitting shows linear dependence on B and displays a slope of 120 μeV/T. By applying this rate to our QD-QR hybrid structure, we estimated the value for the Zeeman splitting on the order of 2.5 meV for B = 21 T in the sample.…”

Section: Magnetophotoluminescencesupporting

confidence: 60%

Structural and magnetic confinement of holes in the spin-polarized emission of coupled quantum ring–quantum dot chains

et al. 2014

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The optical analysis of multilayer structures formed from the topmost layer of InGaAs/GaAs quantum rings (QRs) grown on a vertically stacked and laterally aligned InGaAs/GaAs quantum dot (QD) superlattice has been performed to elucidate the nature of the contribution from each layer. These hybrid structures representing a coupled QR chain layer and the layers of self-assembled QD chains display strong optical anisotropy. Unusually strong oscillations are observed in the circularly polarized photoluminescence (PL) intensities under magnetic field for emissions in the spectral range of the QD structure and these oscillations occur simultaneously with weaker oscillations related to the Aharonov-Bohm interference that modulates the emissions from the QR top layer of the structure. The behavior seen in the magneto-PL spectrum is interpreted in terms of joint effects associated to strain, spatial, and magnetic field confinements on the valence band states forming the magnetoexciton ground state of this multilayered structure. The result can be ascribed to a magnetically induced dark exciton contribution where the heavy-hole (type II) state becomes localized outside, whereas light-hole (type I) as well as electron states remain inside the spatial confinement area of the QD.

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Section: Magnetophotoluminescencesupporting

confidence: 60%

Structural and magnetic confinement of holes in the spin-polarized emission of coupled quantum ring–quantum dot chains

et al. 2014

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“…As mentioned above, a certain softening is expected due to the incomplete dewetting process, however, the results obtained by intraband magneto-dependent spectroscopy 12 cannot be explained without an electron wave function that preserves the ring geometry. On the other hand, no evidence of excitonic AB oscillations have been observed in this kind of QR, 14 a fact that could be related to an increased dotlike character of the exciton wave function due to the enhanced Coulomb interaction in small QRs. 19,20 A detailed calculation of the QR electronic structure, including direct and exchange e-h interactions and the potential geometry revealed by xSTM, is out of the scope of this work; therefore we use the present model with the limitations just mentioned.…”

Section: ⌬Ementioning

confidence: 74%

“…However, QRs have attracted the interest of the scientific community also because of their special topology. [11][12][13][14][15][16][17] The quantum mechanical properties of an electron system circumventing a sufficiently small quantum ring are periodic in the magnetic field flux penetrating the system. It is the signature of the Aharonov-Bohm ͑AB͒ effect.…”

Section: Introductionmentioning

confidence: 99%

Continuum and discrete excitation spectrum of single quantum rings

Alén

Martínez‐Pastor

Granados³

et al. 2005

Phys. Rev. B

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Photoluminescence and excitation of the photoluminescence spectroscopy has been performed in single InGaAs self-assembled quantum rings embedded in a field effect structure device. To determine their electronic structure, bias-dependent optical transitions have been analyzed both, for individual quantum rings, and for the averaged ensemble. Our results are compared with a theoretical model, and also with results reported by other authors studying similar nanostructures.

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“…This results in an additional, diamagnetic term proportional to B 2 , which we ignore here similarly to the experimental papers. 4,7,8,[15][16][17] Certainly, the most drastic assumption seems to be the δ-function potential for the two-particle interaction. Its use is of course motivated by our resulting ability to reduce the computational difficulties as we will show below.…”

Section: Solution Of the Excitonic Casementioning

confidence: 99%

Excitonic Aharonov-Bohm effect in a two-dimensional quantum ring

2011

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We study theoretically the optical properties of an exciton in a two-dimensional ring threaded by a magnetic flux. We model the quantum ring by a confining potential that can be continuously tuned from strictly one-dimensional to truly two-dimensional with finite radius-to-width ratio. We present an analytic solution of the problem when the electron-hole interaction is short ranged. The oscillatory dependence of the oscillator strength as a function of the magnetic flux is attributed to the Aharonov-Bohm effect. The amplitude of the oscillations changes upon increasing the width of the quantum ring. We find that the Aharonov-Bohm oscillations of the ground state of the exciton decrease with increasing the width, but, remarkably, the amplitude remains finite down to radius-to-width ratios less than unity. We attribute this resilience of the excitonic oscillations to the nonsimple connectedness of our chosen confinement potential with its centrifugal core at the origin.

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Magneto-optical properties of ring-shaped self-assembled InGaAs quantum dots

Cited by 48 publications

References 11 publications

Structural and magnetic confinement of holes in the spin-polarized emission of coupled quantum ring–quantum dot chains

Structural and magnetic confinement of holes in the spin-polarized emission of coupled quantum ring–quantum dot chains

Continuum and discrete excitation spectrum of single quantum rings

Excitonic Aharonov-Bohm effect in a two-dimensional quantum ring

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