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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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.

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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
Date:	2011
Volume:	Vol.84
Number:	No.23
Number of Pages:	6
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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URI:	http://wrap.warwick.ac.uk/id/eprint/40115

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