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APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 9
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Phys. Rev. Lett. 102, 096405 (2009) [4 pages]

Exciton Storage in a Nanoscale Aharonov-Bohm Ring with Electric Field Tuning

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Andrea M. Fischer1, Vivaldo L. Campo, Jr.2, Mikhail E. Portnoi3, and Rudolf A. Römer1
1Department of Physics and Centre for Scientific Computing, University of Warwick, Coventry, CV4 7AL, United Kingdom
2Departmento de Fisica, Universidade Federal de São Carlos–UFSCar, 13565-905 São Carlos, SP, Brazil
3School of Physics, University of Exeter, Exeter EX4 4QL, United Kingdom

Received 22 September 2008; published 4 March 2009

We study analytically the optical properties of a simple model for an electron-hole pair on a ring subjected to perpendicular magnetic flux and in-plane electric field. We show how to tune this excitonic system from optically active to optically dark as a function of these external fields. Our results offer a simple mechanism for exciton storage and readout.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.096405
DOI:
10.1103/PhysRevLett.102.096405
PACS:
71.35.Cc, 03.65.Ge
 
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