Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembledInxGa1−xAsquantum rings in GaAs

Abstract

Citation for published version (APA):Fomin, V. M., Gladilin, V. N., Klimin, S. N., Devreese, J. T., Kleemans, N. A. J. M., & Koenraad, P. M. (2007). Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembled Inx Ga1-x As quantum rings in GaAs. Physical Review B, 76(23) 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. Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembled In x Ga 1−x As quantum rings in GaAs We analyze theoretically the electron energy spectrum and the magnetization of an electron in a strained In x Ga 1−x As/ GaAs self-assembled quantum ring ͑SAQR͒ with realistic parameters, determined from the crosssectional scanning-tunneling microscopy characterization of that nanostructure. The SAQRs have an asymmetric indium-rich craterlike shape with a depression rather than an opening at the center. Although the real SAQR shape differs strongly from an idealized circular-symmetric open ring structure, the Aharonov-Bohm oscillations of the magnetization survive.

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

“…An indium concentration of 55% results in a calculated surface relaxation that matches the experimentally determined relaxation of the cleaved surface. 12 This set of geometric and material parameters of the SAQR, which was selected for the analysis of the electron energy spectra in a single-electron SAQR, 14 is used here for the calculations of the electron energy spectra in the two-electron SAQR.…”

“…13 It was explained using the theory of the electron energy spectra and the magnetization of a single-electron SAQR. 14 The electron-electron interaction in the presence of disorder is known to be of key importance in the physics of persistent currents in quantum rings. [15][16][17] Because SAQRs are strongly anisotropic, the potential acting on electrons is analogous to that in an axially symmetric ring with imperfections ͑see e.g., Ref.…”

Aharonov-Bohm Effect in Quantum Nanocups

“…Planelles et al [15] studied the AB electronic spectrum in laterally coupled quantum ring, they found a strong changes in the energy spectrum depending on the coupling regime. Fomin et al [16] studied the electron energy spectrum and the magnetization of an electron has in asymmetric crater-like ring shape, they observed that the AB oscillations of the magnetization survive. Dias da Silva [17] studied the interplay between impurity scattering and Coulomb interaction effects in the absorption spectrum of neutral bound magnetoexcitons confined in quantum-ring structures, they shows that, although a strong impurity scattering kills the AB oscillations in the energy levels.…”

Excitonic behavior in self-assembled InAs/GaAs quantum rings in high magnetic fields

“…12,24,27 The model is used to calculate the single-exciton optical transition probability spectrum. 23 The results are shown in Figs.…”