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Excitonic Aharonov-Bohm effect in a two-dimensional quantum ring

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González-Santander, C., Domínguez-Adame, F. and Roemer, Rudolf A.. (2011) Excitonic Aharonov-Bohm effect in a two-dimensional quantum ring. Physical Review B (Condensed Matter and Materials Physics), Vol.84 (No.23). 235103 . ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.84.235103

Abstract

We study theoretically the optical properties of an exciton in a two-dimensional ring threaded by a magnetic flux. We model the quantum ring by a confining potential that can be continuously tuned from strictly one-dimensional to truly two-dimensional with finite radius-to-width ratio. We present an analytic solution of the problem when the electron-hole interaction is short ranged. The oscillatory dependence of the oscillator strength as a function of the magnetic flux is attributed to the Aharonov-Bohm effect. The amplitude of the oscillations changes upon increasing the width of the quantum ring. We find that the Aharonov-Bohm oscillations of the ground state of the exciton decrease with increasing the width, but, remarkably, the amplitude remains finite down to radius-to-width ratios less than unity. We attribute this resilience of the excitonic oscillations to the nonsimple connectedness of our chosen confinement potential with its centrifugal core at the origin.

Item Type:

Journal Article

Subjects:

Q Science > QC Physics

Divisions:

Faculty of Science > Physics
Faculty of Science > Centre for Scientific Computing

Library of Congress Subject Headings (LCSH):

Exciton theory

Journal or Publication Title:

Physical Review B (Condensed Matter and Materials Physics)

Publisher:

American Physical Society

ISSN:

1098-0121

Official Date:

2011

Dates:

Date	Event
2011	Published

Volume:

Vol.84

Number:

No.23

Number of Pages:

Page Range:

235103

Identification Number:

10.1103/PhysRevB.84.235103

Status:

Peer Reviewed

Publication Status:

Published

Access rights to Published version:

Restricted or Subscription Access

Funder:

Spain. Ministerio de Ciencia e Innovación (MICINN)

Grant number:

Mosaico (MICINN), MAT2010-17180 (MICINN)

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