Energy spectra and oscillatory magnetization of two-electron self-assembled Inx Ga1-x As quantum rings in GaAs

V.M. Fomin, V.N. Gladilin, J.T. Devreese, N.A.J.M. Kleemans, P.M. Koenraad

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The effects of the Coulomb interaction on the energy spectrum and the magnetization of two electrons in a strained Inx Ga1-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 Aharonov-Bohm 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 Inx Ga1-x As/GaAs ringlike nanostructures.
Original languageEnglish
Article number205326
Pages (from-to)205326-1/5
Number of pages5
JournalPhysical Review B
Volume77
Issue number20
DOIs
Publication statusPublished - 2008

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