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

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Gonzalez-Santander de la Cruz, Clara and Domínguez-Adame Acosta, Francisco and Roemer, R. A. (2011) Excitonic Aharonov-Bohm effect in a two-dimensional quantum ring. Physical Review B, 84 (23). ISSN 1098-0121

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


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http://journals.aps.org/Publisher


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:Article
Additional Information:

© 2011 American Physical Society.
We thank Andrea Fischer for valuable discussions and a critical reading of the manuscript. CGS is grateful to the Centre for Scientific Computing for hospitality and to Ministerio de Educación, Comunidad de Madrid, and the European Social Fund for funding the research stays at Warwick during which much of this work was done. Work at Madrid was supported by MICINN (projects Mosaico and MAT2010-17180).

Uncontrolled Keywords:Magnetic-Field, Semiconductor Nanorings, Optical-Properties, Electron-States, Magnetoexcitons, Flux, Dots, Gas
Subjects:Sciences > Physics > Materials
ID Code:27175
Deposited On:29 Oct 2014 10:55
Last Modified:09 Feb 2018 14:46

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