Ground state and far-infrared absorption of two-electron rings in a magnetic field

Puente, A.; Serra, Llorenç

doi:10.1103/physrevb.63.125334

Cited by 31 publications

(33 citation statements)

References 29 publications

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“…Realistic models have been drawn taking into account the true 3D confinement geometry, 23,24 and additional refinements such as strain 25,26 and piezoelectric fields 25 or valence band mixing contributions. 27 This notwithstanding, several authors 12,19,21,[28][29][30] have achieved considerable success catching only the overall ring potential geometry with 2D paraboliclike models, but at the expense of some fitting of the model-dependent parameters to the experimental data.…”

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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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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“…The high sensitivity of the ''Ϫ'' edge modes to the ring morphology might help to shed light onto the actual structure of the ring inner edge. 19 We recall that the experimental nanoscopic rings 3 have been fabricated from InAs self-assembled dots grown on GaAs covered by a thin layer of GaAs by an annealing process.…”

Section: Raman Spectramentioning

confidence: 99%

“…5,6 In nanoscopic rings quantum effects are important and for this reason theoretical studies at a more microscopic level have been undertaken. [7][8][9][10][11][12][13][14][15][16][17][18][19] In some of these calculations a major emphasis has been put on describing the Aharonov-Bohm ͑AB͒ quantum effect which manifests in the presence of an external magnetic field ͑B͒ as the existence of a persistent current, and leads to periodic oscillations in the energy spectrum and the persistent current as a function of B. These AB oscillations have been observed in mesoscopic rings in a GaAlAs/GaAs heterostructure by measuring the conductance across the ring.…”

Section: Introductionmentioning

confidence: 99%

Multipole modes and spin features in the Raman spectrum of nanoscopic quantum rings

et al. 2001

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We present a systematic study of ground state and spectroscopic properties of many-electron nanoscopic quantum rings. Addition energies at zero magnetic field ͑B͒ and electrochemical potentials as a function of B are given for a ring hosting up to 24 electrons. We find discontinuities in the excitation energies of multipole spin and charge density modes, and a coupling between the charge and spin density responses that allow to identify the formation of ferromagnetic ground states in narrow magnetic field regions. These effects can be observed in Raman experiments, and are related to the fractional Aharonov-Bohm oscillations of the energy and of the persistent current in the ring.

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“…26 The solution of the Schrödinger equation for two electrons in a quantum ring with a circularly symmetric nonparabolic confinement potential was obtained in Ref. 27 by discretizing the coordinate space in a uniform grid of points. The height of the repulsive central barrier in the confining potential is shown to significantly influence the ring properties.…”

Section: Introductionmentioning

confidence: 99%

Energy spectra and oscillatory magnetization of two-electron self-assembledInxGa1−xAsquantum rings in GaAs

et al. 2008

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Citation for published version (APA):Fomin, V. M., Gladilin, V. N., Devreese, J. T., Kleemans, N. A. J. M., & Koenraad, P. M. (2008). Energy spectra and oscillatory magnetization of two-electron self-assembled Inx Ga1-x As quantum rings in GaAs. Physical Review B, 77(20) Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement: www.tue.nl/taverne Take down policy If you believe that this document breaches copyright please contact us at: openaccess@tue.nl providing details and we will investigate your claim. The effects of the Coulomb interaction on the energy spectrum and the magnetization of two electrons in a strained In x Ga 1−x As/ GaAs ringlike nanostructure are analyzed with realistic parameters inferred from the cross-sectional scanning-tunneling microscopy data. With an increasing magnetic field, the lowest spin-singlet and spin-triplet states sequentially replace each other as the ground state. This is reminiscent of the AharonovBohm effect for the ringlike structures. The exchange interaction leads to a more complicated oscillatory structure of the magnetic moment of the two electrons as a function of the magnetic field as compared to the magnetization pattern for a single-electron ringlike nanostructure. We discuss the relevance of the two-electron systems for the interpretation of the Aharonov-Bohm oscillations in the persistent current observed in low temperature magnetization measurements on self-assembled In x Ga 1−x As/ GaAs ringlike nanostructures.

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Ground state and far-infrared absorption of two-electron rings in a magnetic field

Cited by 31 publications

References 29 publications

Continuum and discrete excitation spectrum of single quantum rings

Continuum and discrete excitation spectrum of single quantum rings

Multipole modes and spin features in the Raman spectrum of nanoscopic quantum rings

Energy spectra and oscillatory magnetization of two-electron self-assembledInxGa1−xAsquantum rings in GaAs

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