Self-organized quantum rings: physical characterization and theoretical modeling

V.M. Fomin, V.N. Gladilin, J. van Bree, M.E. Flatté, J.T. Devreese, P. M. Koenraad

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

Abstract

An adequate modeling of 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 in 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. Large magnetic moments of QRs are shown to originate from dissipationless circulating currents in the ground state of an electron or hole in the QR. Examples of prospective applications of QRs are presented that do and do not utilize the topological properties of QRs.

LanguageEnglish
Title of host publicationPhysics of quantum rings
EditorsVladimir M. Fomin
Place of PublicationCham
PublisherSpringer
Pages91-120
Number of pages30
ISBN (Electronic)978-3-319-95159-1
ISBN (Print)978-3-319-95158-4
DOIs
StatePublished - 1 Jan 2018

Publication series

NameNanoScience and Technology
VolumePart F2
ISSN (Print)1434-4904

Fingerprint

Indium
Magnetization
rings
Scanning tunneling microscopy
Magnetic moments
Electronic properties
Torsional stress
Ground state
Nanostructures
Materials properties
Magnetic fields
Geometry
Electrons
Chemical analysis
ring structures
indium
magnetization
craters
torsion
magnetic measurement

Cite this

Fomin, V. M., Gladilin, V. N., van Bree, J., Flatté, M. E., Devreese, J. T., & Koenraad, P. M. (2018). Self-organized quantum rings: physical characterization and theoretical modeling. In V. M. Fomin (Ed.), Physics of quantum rings (pp. 91-120). (NanoScience and Technology; Vol. Part F2). Cham: Springer. DOI: 10.1007/978-3-319-95159-1_4
Fomin, V.M. ; Gladilin, V.N. ; van Bree, J. ; Flatté, M.E. ; Devreese, J.T. ; Koenraad, P. M./ Self-organized quantum rings : physical characterization and theoretical modeling. Physics of quantum rings. editor / Vladimir M. Fomin. Cham : Springer, 2018. pp. 91-120 (NanoScience and Technology).
@inbook{7182cc12b28e4d0a8005a58b9583bdbb,
title = "Self-organized quantum rings: physical characterization and theoretical modeling",
abstract = "An adequate modeling of 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 in 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. Large magnetic moments of QRs are shown to originate from dissipationless circulating currents in the ground state of an electron or hole in the QR. Examples of prospective applications of QRs are presented that do and do not utilize the topological properties of QRs.",
author = "V.M. Fomin and V.N. Gladilin and {van Bree}, J. and M.E. Flatt{\'e} and J.T. Devreese and Koenraad, {P. M.}",
year = "2018",
month = "1",
day = "1",
doi = "10.1007/978-3-319-95159-1_4",
language = "English",
isbn = "978-3-319-95158-4",
series = "NanoScience and Technology",
publisher = "Springer",
pages = "91--120",
editor = "Fomin, {Vladimir M.}",
booktitle = "Physics of quantum rings",
address = "Germany",

}

Fomin, VM, Gladilin, VN, van Bree, J, Flatté, ME, Devreese, JT & Koenraad, PM 2018, Self-organized quantum rings: physical characterization and theoretical modeling. in VM Fomin (ed.), Physics of quantum rings. NanoScience and Technology, vol. Part F2, Springer, Cham, pp. 91-120. DOI: 10.1007/978-3-319-95159-1_4

Self-organized quantum rings : physical characterization and theoretical modeling. / Fomin, V.M.; Gladilin, V.N.; van Bree, J.; Flatté, M.E.; Devreese, J.T.; Koenraad, P. M.

Physics of quantum rings. ed. / Vladimir M. Fomin. Cham : Springer, 2018. p. 91-120 (NanoScience and Technology; Vol. Part F2).

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

TY - CHAP

T1 - Self-organized quantum rings

T2 - physical characterization and theoretical modeling

AU - Fomin,V.M.

AU - Gladilin,V.N.

AU - van Bree,J.

AU - Flatté,M.E.

AU - Devreese,J.T.

AU - Koenraad,P. M.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - An adequate modeling of 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 in 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. Large magnetic moments of QRs are shown to originate from dissipationless circulating currents in the ground state of an electron or hole in the QR. Examples of prospective applications of QRs are presented that do and do not utilize the topological properties of QRs.

AB - An adequate modeling of 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 in 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. Large magnetic moments of QRs are shown to originate from dissipationless circulating currents in the ground state of an electron or hole in the QR. Examples of prospective applications of QRs are presented that do and do not utilize the topological properties of QRs.

UR - http://www.scopus.com/inward/record.url?scp=85052855837&partnerID=8YFLogxK

U2 - 10.1007/978-3-319-95159-1_4

DO - 10.1007/978-3-319-95159-1_4

M3 - Chapter

SN - 978-3-319-95158-4

T3 - NanoScience and Technology

SP - 91

EP - 120

BT - Physics of quantum rings

PB - Springer

CY - Cham

ER -

Fomin VM, Gladilin VN, van Bree J, Flatté ME, Devreese JT, Koenraad PM. Self-organized quantum rings: physical characterization and theoretical modeling. In Fomin VM, editor, Physics of quantum rings. Cham: Springer. 2018. p. 91-120. (NanoScience and Technology). Available from, DOI: 10.1007/978-3-319-95159-1_4