Self-organized quantum rings: physical characterization and theoretical modeling

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

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureHoofdstukAcademicpeer review

Samenvatting

An adequate modeling of the self-organized quantum rings is possible only on the basis of the modern characterization of those nanostructures.We discuss an atomic-scale analysis of the indium distribution of self-organized InGaAs quantum rings (QRs). The analysis of the shape, size and composition of self-organized InGaAs QRs at the atomic scale reveals that AFM only shows the material coming out of the QDs during the QR formation. The remaining QD material, as observed by Cross-Sectional Scanning Tunneling Microscopy (X-STM), shows an asymmetric indium-rich crater-like shape with a depression rather than an opening at the center and determines the observed ring-like electronic properties of QR structures. A theoretical model of the geometry and materials properties of the self-organized QRs is developed on that basis and the magnetization is calculated as a function of the applied magnetic field. Although the real QR shape differs strongly from an idealized circular-symmetric open-ring structure, Aharonov-Bohm-type oscillations in the magnetization have been predicted to survive. They have been observed using the torsion magnetometry on InGaAs QRs. Examples of prospective applications of QRs are presented that do and do not utilize the topological properties of QRs.

Originele taal-2Engels
TitelPhysics of quantum rings
RedacteurenV.M. Fomin
Plaats van productieBerlin
UitgeverijSpringer
Pagina's83-105
Aantal pagina's23
ISBN van elektronische versie978-3-642-39197-2
ISBN van geprinte versie978-3-642-39196-5
DOI's
StatusGepubliceerd - 2014

Publicatie series

NaamNanoScience and Technology
ISSN van geprinte versie1434-4904
ISSN van elektronische versie2197-7127

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