Energy spectra and oscillatory magnetization of two-electron self-assembled Inx Ga1-x As quantum rings in GaAs
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FOMIN, Vladimir, GLADILIN, Vladimir, DEVREESE, Josef T., KLEEMANS, N. A.J.M., KOENRAAD, Paul M.. Energy spectra and oscillatory magnetization of two-electron self-assembled Inx Ga1-x As quantum rings in GaAs. In: Physical Review B - Condensed Matter and Materials Physics, 2008, vol. 77, p. 0. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.77.205326
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Physical Review B - Condensed Matter and Materials Physics
Volumul 77 / 2008 / ISSN 1098-0121 /ISSNe 1550-235X

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

DOI: https://doi.org/10.1103/PhysRevB.77.205326

Pag. 0-0

Fomin Vladimir123, Gladilin Vladimir134, Devreese Josef T.21, Kleemans N. A.J.M.2, Koenraad Paul M.2
 
1 University of Antwerp,
2 Eindhoven University of Technology,
3 Moldova State University,
4 Catholic University of Leuven (KU Leuven)
 
Disponibil în IBN: 27 iunie 2023


Rezumat

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. 

Cuvinte-cheie
Quantum Double, Gallium Arsenides, Ring